diff --git a/apps/admin_audit/lib/Actions/AppManagement.php b/apps/admin_audit/lib/Actions/AppManagement.php
index 7831c850a8..24656fe6de 100644
--- a/apps/admin_audit/lib/Actions/AppManagement.php
+++ b/apps/admin_audit/lib/Actions/AppManagement.php
@@ -41,7 +41,7 @@ class AppManagement extends Action {
 	 * @param string[] $groups
 	 */
 	public function enableAppForGroups(string $appName, array $groups) {
-		$this->log('App "%s" enabled for groups: %s',
+		$this->log('App "%1$s" enabled for groups: %2$s',
 			['app' => $appName, 'groups' => implode(', ', $groups)],
 			['app', 'groups']
 		);
diff --git a/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php b/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
index 54feaa57ac..6f303acba3 100644
--- a/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
+++ b/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
@@ -225,7 +225,7 @@ class IMipPlugin extends SabreIMipPlugin {
 		);
 
 		$fromEMail = \OCP\Util::getDefaultEmailAddress('invitations-noreply');
-		$fromName = $l10n->t('%s via %s', [$senderName, $this->defaults->getName()]);
+		$fromName = $l10n->t('%1$s via %2$s', [$senderName, $this->defaults->getName()]);
 
 		$message = $this->mailer->createMessage()
 			->setFrom([$fromEMail => $fromName])
@@ -438,14 +438,14 @@ class IMipPlugin extends SabreIMipPlugin {
 		if ($method === self::METHOD_CANCEL) {
 			$template->setSubject('Cancelled: ' . $summary);
 			$template->addHeading($l10n->t('Invitation canceled'), $l10n->t('Hello %s,', [$attendeeName]));
-			$template->addBodyText($l10n->t('The meeting »%s« with %s was canceled.', [$summary, $inviteeName]));
+			$template->addBodyText($l10n->t('The meeting »%1$s« with %2$s was canceled.', [$summary, $inviteeName]));
 		} else if ($method === self::METHOD_REPLY) {
 			$template->setSubject('Re: ' . $summary);
 			$template->addHeading($l10n->t('Invitation updated'), $l10n->t('Hello %s,', [$attendeeName]));
-			$template->addBodyText($l10n->t('The meeting »%s« with %s was updated.', [$summary, $inviteeName]));
+			$template->addBodyText($l10n->t('The meeting »%1$s« with %2$s was updated.', [$summary, $inviteeName]));
 		} else {
 			$template->setSubject('Invitation: ' . $summary);
-			$template->addHeading($l10n->t('%s invited you to »%s«', [$inviteeName, $summary]), $l10n->t('Hello %s,', [$attendeeName]));
+			$template->addHeading($l10n->t('%1$s invited you to »%2$s«', [$inviteeName, $summary]), $l10n->t('Hello %s,', [$attendeeName]));
 		}
 
 	}
diff --git a/apps/federatedfilesharing/lib/FederatedShareProvider.php b/apps/federatedfilesharing/lib/FederatedShareProvider.php
index d1560d90ef..f0ec9e3cb6 100644
--- a/apps/federatedfilesharing/lib/FederatedShareProvider.php
+++ b/apps/federatedfilesharing/lib/FederatedShareProvider.php
@@ -184,8 +184,8 @@ class FederatedShareProvider implements IShareProvider {
 		$alreadyShared = $this->getSharedWith($shareWith, \OCP\Share::SHARE_TYPE_REMOTE, $share->getNode(), 1, 0);
 		$alreadySharedGroup = $this->getSharedWith($shareWith, \OCP\Share::SHARE_TYPE_REMOTE_GROUP, $share->getNode(), 1, 0);
 		if (!empty($alreadyShared) || !empty($alreadySharedGroup)) {
-			$message = 'Sharing %s failed, because this item is already shared with %s';
-			$message_t = $this->l->t('Sharing %s failed, because this item is already shared with %s', array($share->getNode()->getName(), $shareWith));
+			$message = 'Sharing %1$s failed, because this item is already shared with %2$s';
+			$message_t = $this->l->t('Sharing %1$s failed, because this item is already shared with %2$s', array($share->getNode()->getName(), $shareWith));
 			$this->logger->debug(sprintf($message, $share->getNode()->getName(), $shareWith), ['app' => 'Federated File Sharing']);
 			throw new \Exception($message_t);
 		}
@@ -298,7 +298,7 @@ class FederatedShareProvider implements IShareProvider {
 
 		if($failure) {
 			$this->removeShareFromTableById($shareId);
-			$message_t = $this->l->t('Sharing %s failed, could not find %s, maybe the server is currently unreachable or uses a self-signed certificate.',
+			$message_t = $this->l->t('Sharing %1$s failed, could not find %2$s, maybe the server is currently unreachable or uses a self-signed certificate.',
 				[$share->getNode()->getName(), $share->getSharedWith()]);
 			throw new \Exception($message_t);
 		}
diff --git a/apps/files/templates/appnavigation.php b/apps/files/templates/appnavigation.php
index a2361d9200..c6361d0ca4 100644
--- a/apps/files/templates/appnavigation.php
+++ b/apps/files/templates/appnavigation.php
@@ -17,7 +17,7 @@
 			<a href="#" class="icon-quota svg">
 				<p id="quotatext"><?php
 					if ($_['quota'] !== \OCP\Files\FileInfo::SPACE_UNLIMITED) {
-						p($l->t('%s of %s used', [$_['usage'], $_['total_space']]));
+						p($l->t('%1$s of %2$s used', [$_['usage'], $_['total_space']]));
 					} else {
 						p($l->t('%s used', [$_['usage']]));
 					} ?></p>
diff --git a/apps/files_external/lib/config.php b/apps/files_external/lib/config.php
index a1e7d12bca..7fb118c2de 100644
--- a/apps/files_external/lib/config.php
+++ b/apps/files_external/lib/config.php
@@ -324,7 +324,7 @@ class OC_Mount_Config {
 			case 'ftp':
 				return (string)$l->t('The FTP support in PHP is not enabled or installed. Mounting of %s is not possible. Please ask your system administrator to install it.', [$backend]);
 			default:
-				return (string)$l->t('"%s" is not installed. Mounting of %s is not possible. Please ask your system administrator to install it.', [$module, $backend]);
+				return (string)$l->t('"%1$s" is not installed. Mounting of %2$s is not possible. Please ask your system administrator to install it.', [$module, $backend]);
 		}
 	}
 
diff --git a/apps/files_sharing/lib/Controller/ShareAPIController.php b/apps/files_sharing/lib/Controller/ShareAPIController.php
index 308e7bbb74..ff19c35e2b 100644
--- a/apps/files_sharing/lib/Controller/ShareAPIController.php
+++ b/apps/files_sharing/lib/Controller/ShareAPIController.php
@@ -493,14 +493,14 @@ class ShareAPIController extends OCSController {
 
 		} else if ($shareType === Share::SHARE_TYPE_REMOTE) {
 			if (!$this->shareManager->outgoingServer2ServerSharesAllowed()) {
-				throw new OCSForbiddenException($this->l->t('Sharing %s failed because the back end does not allow shares from type %s', [$path->getPath(), $shareType]));
+				throw new OCSForbiddenException($this->l->t('Sharing %1$s failed because the back end does not allow shares from type %2$s', [$path->getPath(), $shareType]));
 			}
 
 			$share->setSharedWith($shareWith);
 			$share->setPermissions($permissions);
 		}  else if ($shareType === Share::SHARE_TYPE_REMOTE_GROUP) {
 			if (!$this->shareManager->outgoingServer2ServerGroupSharesAllowed()) {
-				throw new OCSForbiddenException($this->l->t('Sharing %s failed because the back end does not allow shares from type %s', [$path->getPath(), $shareType]));
+				throw new OCSForbiddenException($this->l->t('Sharing %1$s failed because the back end does not allow shares from type %2$s', [$path->getPath(), $shareType]));
 			}
 
 			$share->setSharedWith($shareWith);
diff --git a/apps/sharebymail/lib/ShareByMailProvider.php b/apps/sharebymail/lib/ShareByMailProvider.php
index 9ae26442ac..26a9beefdf 100644
--- a/apps/sharebymail/lib/ShareByMailProvider.php
+++ b/apps/sharebymail/lib/ShareByMailProvider.php
@@ -165,8 +165,8 @@ class ShareByMailProvider implements IShareProvider {
 		 */
 		$alreadyShared = $this->getSharedWith($shareWith, \OCP\Share::SHARE_TYPE_EMAIL, $share->getNode(), 1, 0);
 		if (!empty($alreadyShared)) {
-			$message = 'Sharing %s failed, this item is already shared with %s';
-			$message_t = $this->l->t('Sharing %s failed, this item is already shared with %s', array($share->getNode()->getName(), $shareWith));
+			$message = 'Sharing %1$s failed, this item is already shared with %2$s';
+			$message_t = $this->l->t('Sharing %1$s failed, this item is already shared with %2$s', array($share->getNode()->getName(), $shareWith));
 			$this->logger->debug(sprintf($message, $share->getNode()->getName(), $shareWith), ['app' => 'Federated File Sharing']);
 			throw new \Exception($message_t);
 		}
@@ -400,10 +400,10 @@ class ShareByMailProvider implements IShareProvider {
 			'shareWith' => $shareWith,
 		]);
 
-		$emailTemplate->setSubject($this->l->t('%s shared »%s« with you', array($initiatorDisplayName, $filename)));
+		$emailTemplate->setSubject($this->l->t('%1$s shared »%2$s« with you', array($initiatorDisplayName, $filename)));
 		$emailTemplate->addHeader();
-		$emailTemplate->addHeading($this->l->t('%s shared »%s« with you', [$initiatorDisplayName, $filename]), false);
-		$text = $this->l->t('%s shared »%s« with you.', [$initiatorDisplayName, $filename]);
+		$emailTemplate->addHeading($this->l->t('%1$s shared »%2$s« with you', [$initiatorDisplayName, $filename]), false);
+		$text = $this->l->t('%1$s shared »%2$s« with you.', [$initiatorDisplayName, $filename]);
 
 		$emailTemplate->addBodyText(
 			htmlspecialchars($text . ' ' . $this->l->t('Click the button below to open it.')),
@@ -419,7 +419,7 @@ class ShareByMailProvider implements IShareProvider {
 		// The "From" contains the sharers name
 		$instanceName = $this->defaults->getName();
 		$senderName = $this->l->t(
-			'%s via %s',
+			'%1$s via %2$s',
 			[
 				$initiatorDisplayName,
 				$instanceName
@@ -462,8 +462,8 @@ class ShareByMailProvider implements IShareProvider {
 		$initiatorDisplayName = ($initiatorUser instanceof IUser) ? $initiatorUser->getDisplayName() : $initiator;
 		$initiatorEmailAddress = ($initiatorUser instanceof IUser) ? $initiatorUser->getEMailAddress() : null;
 
-		$plainBodyPart = $this->l->t("%s shared »%s« with you.\nYou should have already received a separate mail with a link to access it.\n", [$initiatorDisplayName, $filename]);
-		$htmlBodyPart = $this->l->t('%s shared »%s« with you. You should have already received a separate mail with a link to access it.', [$initiatorDisplayName, $filename]);
+		$plainBodyPart = $this->l->t("%1\$s shared »%2\$s« with you.\nYou should have already received a separate mail with a link to access it.\n", [$initiatorDisplayName, $filename]);
+		$htmlBodyPart = $this->l->t('%1$s shared »%2$s« with you. You should have already received a separate mail with a link to access it.', [$initiatorDisplayName, $filename]);
 
 		$message = $this->mailer->createMessage();
 
@@ -475,7 +475,7 @@ class ShareByMailProvider implements IShareProvider {
 			'shareWith' => $shareWith,
 		]);
 
-		$emailTemplate->setSubject($this->l->t('Password to access »%s« shared to you by %s', [$filename, $initiatorDisplayName]));
+		$emailTemplate->setSubject($this->l->t('Password to access »%1$s« shared to you by %2$s', [$filename, $initiatorDisplayName]));
 		$emailTemplate->addHeader();
 		$emailTemplate->addHeading($this->l->t('Password to access »%s«', [$filename]), false);
 		$emailTemplate->addBodyText(htmlspecialchars($htmlBodyPart), $plainBodyPart);
@@ -485,7 +485,7 @@ class ShareByMailProvider implements IShareProvider {
 		// The "From" contains the sharers name
 		$instanceName = $this->defaults->getName();
 		$senderName = $this->l->t(
-			'%s via %s',
+			'%1$s via %2$s',
 			[
 				$initiatorDisplayName,
 				$instanceName
@@ -586,7 +586,7 @@ class ShareByMailProvider implements IShareProvider {
 			);
 		}
 
-		$bodyPart = $this->l->t("You just shared »%s« with %s. The share was already send to the recipient. Due to the security policies defined by the administrator of %s each share needs to be protected by password and it is not allowed to send the password directly to the recipient. Therefore you need to forward the password manually to the recipient.", [$filename, $shareWith, $this->defaults->getName()]);
+		$bodyPart = $this->l->t('You just shared »%1$s« with %2$s. The share was already send to the recipient. Due to the security policies defined by the administrator of %3$s each share needs to be protected by password and it is not allowed to send the password directly to the recipient. Therefore you need to forward the password manually to the recipient.', [$filename, $shareWith, $this->defaults->getName()]);
 
 		$message = $this->mailer->createMessage();
 		$emailTemplate = $this->mailer->createEMailTemplate('sharebymail.OwnerPasswordNotification', [
@@ -597,7 +597,7 @@ class ShareByMailProvider implements IShareProvider {
 			'shareWith' => $shareWith,
 		]);
 
-		$emailTemplate->setSubject($this->l->t('Password to access »%s« shared with %s', [$filename, $shareWith]));
+		$emailTemplate->setSubject($this->l->t('Password to access »%1$s« shared with %2$s', [$filename, $shareWith]));
 		$emailTemplate->addHeader();
 		$emailTemplate->addHeading($this->l->t('Password to access »%s«', [$filename]), false);
 		$emailTemplate->addBodyText($bodyPart);
diff --git a/core/ajax/update.php b/core/ajax/update.php
index 377da74610..6def2c6797 100644
--- a/core/ajax/update.php
+++ b/core/ajax/update.php
@@ -187,7 +187,7 @@ if (\OCP\Util::needUpgrade()) {
 		$eventSource->send('success', (string)$l->t('Checked database schema update for apps'));
 	});
 	$updater->listen('\OC\Updater', 'appUpgrade', function ($app, $version) use ($eventSource, $l) {
-		$eventSource->send('success', (string)$l->t('Updated "%s" to %s', array($app, $version)));
+		$eventSource->send('success', (string)$l->t('Updated "%1$s" to %2$s', array($app, $version)));
 	});
 	$updater->listen('\OC\Updater', 'incompatibleAppDisabled', function ($app) use (&$incompatibleApps) {
 		$incompatibleApps[]= $app;
diff --git a/core/templates/loginflow/authpicker.php b/core/templates/loginflow/authpicker.php
index 4e2282a180..7c7eabd308 100644
--- a/core/templates/loginflow/authpicker.php
+++ b/core/templates/loginflow/authpicker.php
@@ -30,7 +30,7 @@ $urlGenerator = $_['urlGenerator'];
 <div class="picker-window">
 	<h2><?php p($l->t('Connect to your account')) ?></h2>
 	<p class="info">
-		<?php print_unescaped($l->t('Please log in before granting %s access to your %s account.', [
+		<?php print_unescaped($l->t('Please log in before granting %1$s access to your %2$s account.', [
 								'<strong>' . \OCP\Util::sanitizeHTML($_['client']) . '</strong>',
 								\OCP\Util::sanitizeHTML($_['instanceName'])
 							])) ?>
diff --git a/core/templates/loginflow/grant.php b/core/templates/loginflow/grant.php
index 6278e910bd..a03b31f762 100644
--- a/core/templates/loginflow/grant.php
+++ b/core/templates/loginflow/grant.php
@@ -30,7 +30,7 @@ $urlGenerator = $_['urlGenerator'];
 <div class="picker-window">
 	<h2><?php p($l->t('Account access')) ?></h2>
 	<p class="info">
-		<?php print_unescaped($l->t('You are about to grant %s access to your %s account.', [
+		<?php print_unescaped($l->t('You are about to grant %1$s access to your %2$s account.', [
 								'<strong>' . \OCP\Util::sanitizeHTML($_['client']) . '</strong>',
 								\OCP\Util::sanitizeHTML($_['instanceName'])
 							])) ?>
diff --git a/core/templates/untrustedDomain.php b/core/templates/untrustedDomain.php
index 1443c41282..7de4ff78f3 100644
--- a/core/templates/untrustedDomain.php
+++ b/core/templates/untrustedDomain.php
@@ -8,6 +8,6 @@
 	</p>
 	<br />
 	<p>
-		<?php print_unescaped($l->t('Further information how to configure this can be found in the %sdocumentation%s.', ['<a href="' . $_['docUrl'] . '" target="blank">', '</a>'])); ?>
+		<?php print_unescaped($l->t('Further information how to configure this can be found in the %1$sdocumentation%2$s.', ['<a href="' . $_['docUrl'] . '" target="blank">', '</a>'])); ?>
 	</p>
 </div>
diff --git a/core/templates/update.admin.php b/core/templates/update.admin.php
index e8087b297e..f4a1c72ae8 100644
--- a/core/templates/update.admin.php
+++ b/core/templates/update.admin.php
@@ -3,7 +3,7 @@
 		<?php if ($_['isAppsOnlyUpgrade']) { ?>
 		<h2 class="title"><?php p($l->t('App update required')); ?></h2>
 		<?php } else { ?>
-		<h2 class="title"><?php p($l->t('%s will be updated to version %s',
+		<h2 class="title"><?php p($l->t('%1$s will be updated to version %2$s',
 			array($_['productName'], $_['version']))); ?></h2>
 		<?php } ?>
 		<?php if (!empty($_['appsToUpgrade'])) { ?>
diff --git a/lib/private/App/DependencyAnalyzer.php b/lib/private/App/DependencyAnalyzer.php
index e8da5a0b63..1e4d597dbc 100644
--- a/lib/private/App/DependencyAnalyzer.php
+++ b/lib/private/App/DependencyAnalyzer.php
@@ -236,7 +236,7 @@ class DependencyAnalyzer {
 			$libName = $this->getValue($lib);
 			$libVersion = $this->platform->getLibraryVersion($libName);
 			if (is_null($libVersion)) {
-				$missing[] = (string)$this->l->t('The library %s is not available.', [$libName]);
+				$missing[] = $this->l->t('The library %s is not available.', [$libName]);
 				continue;
 			}
 
@@ -244,15 +244,15 @@ class DependencyAnalyzer {
 				if (isset($lib['@attributes']['min-version'])) {
 					$minVersion = $lib['@attributes']['min-version'];
 					if ($this->compareSmaller($libVersion, $minVersion)) {
-						$missing[] = (string)$this->l->t('Library %s with a version higher than %s is required - available version %s.',
-							array($libName, $minVersion, $libVersion));
+						$missing[] = $this->l->t('Library %1$s with a version higher than %2$s is required - available version %3$s.',
+							[$libName, $minVersion, $libVersion]);
 					}
 				}
 				if (isset($lib['@attributes']['max-version'])) {
 					$maxVersion = $lib['@attributes']['max-version'];
 					if ($this->compareBigger($libVersion, $maxVersion)) {
-						$missing[] = (string)$this->l->t('Library %s with a version lower than %s is required - available version %s.',
-							array($libName, $maxVersion, $libVersion));
+						$missing[] = $this->l->t('Library %1$s with a version lower than %2$s is required - available version %3$s.',
+							[$libName, $maxVersion, $libVersion]);
 					}
 				}
 			}
diff --git a/lib/private/Share/Share.php b/lib/private/Share/Share.php
index 0a9371d35b..36912dcafe 100644
--- a/lib/private/Share/Share.php
+++ b/lib/private/Share/Share.php
@@ -413,8 +413,8 @@ class Share extends Constants {
 				throw new \Exception($message_t);
 			}
 			if (!\OC::$server->getUserManager()->userExists($shareWith)) {
-				$message = 'Sharing %s failed, because the user %s does not exist';
-				$message_t = $l->t('Sharing %s failed, because the user %s does not exist', array($itemSourceName, $shareWith));
+				$message = 'Sharing %1$s failed, because the user %2$s does not exist';
+				$message_t = $l->t('Sharing %1$s failed, because the user %2$s does not exist', array($itemSourceName, $shareWith));
 				\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $shareWith), ILogger::DEBUG);
 				throw new \Exception($message_t);
 			}
@@ -433,9 +433,9 @@ class Share extends Constants {
 				}
 				$inGroup = array_intersect($groupsOwner, $groupsShareWith);
 				if (empty($inGroup)) {
-					$message = 'Sharing %s failed, because the user '
-						.'%s is not a member of any groups that %s is a member of';
-					$message_t = $l->t('Sharing %s failed, because the user %s is not a member of any groups that %s is a member of', array($itemName, $shareWith, $uidOwner));
+					$message = 'Sharing %1$s failed, because the user '
+						.'%2$s is not a member of any groups that %3$s is a member of';
+					$message_t = $l->t('Sharing %1$s failed, because the user %2$s is not a member of any groups that %3$s is a member of', array($itemName, $shareWith, $uidOwner));
 					\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemName, $shareWith, $uidOwner), ILogger::DEBUG);
 					throw new \Exception($message_t);
 				}
@@ -447,8 +447,8 @@ class Share extends Constants {
 				// owner and is not a user share, this use case is for increasing
 				// permissions for a specific user
 				if ($checkExists['uid_owner'] != $uidOwner || $checkExists['share_type'] == $shareType) {
-					$message = 'Sharing %s failed, because this item is already shared with %s';
-					$message_t = $l->t('Sharing %s failed, because this item is already shared with %s', array($itemSourceName, $shareWith));
+					$message = 'Sharing %1$s failed, because this item is already shared with %2$s';
+					$message_t = $l->t('Sharing %1$s failed, because this item is already shared with %2$s', array($itemSourceName, $shareWith));
 					\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $shareWith), ILogger::DEBUG);
 					throw new \Exception($message_t);
 				}
@@ -459,16 +459,16 @@ class Share extends Constants {
 				// owner and is not a user share, this use case is for increasing
 				// permissions for a specific user
 				if ($checkExists['uid_owner'] != $uidOwner || $checkExists['share_type'] == $shareType) {
-					$message = 'Sharing %s failed, because this item is already shared with user %s';
-					$message_t = $l->t('Sharing %s failed, because this item is already shared with user %s', array($itemSourceName, $shareWith));
+					$message = 'Sharing %1$s failed, because this item is already shared with user %2$s';
+					$message_t = $l->t('Sharing %1$s failed, because this item is already shared with user %2$s', array($itemSourceName, $shareWith));
 					\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $shareWith), ILogger::ERROR);
 					throw new \Exception($message_t);
 				}
 			}
 		} else if ($shareType === self::SHARE_TYPE_GROUP) {
 			if (!\OC::$server->getGroupManager()->groupExists($shareWith)) {
-				$message = 'Sharing %s failed, because the group %s does not exist';
-				$message_t = $l->t('Sharing %s failed, because the group %s does not exist', array($itemSourceName, $shareWith));
+				$message = 'Sharing %1$s failed, because the group %2$s does not exist';
+				$message_t = $l->t('Sharing %1$s failed, because the group %2$s does not exist', array($itemSourceName, $shareWith));
 				\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $shareWith), ILogger::DEBUG);
 				throw new \Exception($message_t);
 			}
@@ -476,9 +476,9 @@ class Share extends Constants {
 				$group = \OC::$server->getGroupManager()->get($shareWith);
 				$user = \OC::$server->getUserManager()->get($uidOwner);
 				if (!$group || !$user || !$group->inGroup($user)) {
-					$message = 'Sharing %s failed, because '
-						. '%s is not a member of the group %s';
-					$message_t = $l->t('Sharing %s failed, because %s is not a member of the group %s', array($itemSourceName, $uidOwner, $shareWith));
+					$message = 'Sharing %1$s failed, because '
+						. '%2$s is not a member of the group %3$s';
+					$message_t = $l->t('Sharing %1$s failed, because %2$s is not a member of the group %3$s', array($itemSourceName, $uidOwner, $shareWith));
 					\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $uidOwner, $shareWith), ILogger::DEBUG);
 					throw new \Exception($message_t);
 				}
@@ -489,8 +489,8 @@ class Share extends Constants {
 				null, self::FORMAT_NONE, null, 1, true, true)) {
 
 				if ($checkExists['share_with'] === $shareWith && $checkExists['share_type'] === \OCP\Share::SHARE_TYPE_GROUP) {
-					$message = 'Sharing %s failed, because this item is already shared with %s';
-					$message_t = $l->t('Sharing %s failed, because this item is already shared with %s', array($itemSourceName, $shareWith));
+					$message = 'Sharing %1$s failed, because this item is already shared with %2$s';
+					$message_t = $l->t('Sharing %1$s failed, because this item is already shared with %2$s', array($itemSourceName, $shareWith));
 					\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $shareWith), ILogger::DEBUG);
 					throw new \Exception($message_t);
 				}
@@ -595,8 +595,8 @@ class Share extends Constants {
 			 */
 			if ($checkExists = self::getItems($itemType, $itemSource, self::SHARE_TYPE_REMOTE,
 				$shareWith, $uidOwner, self::FORMAT_NONE, null, 1, true, true)) {
-					$message = 'Sharing %s failed, because this item is already shared with %s';
-					$message_t = $l->t('Sharing %s failed, because this item is already shared with %s', array($itemSourceName, $shareWith));
+					$message = 'Sharing %1$s failed, because this item is already shared with %2$s';
+					$message_t = $l->t('Sharing %1$s failed, because this item is already shared with %2$s', array($itemSourceName, $shareWith));
 					\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $shareWith), ILogger::DEBUG);
 					throw new \Exception($message_t);
 			}
@@ -626,15 +626,15 @@ class Share extends Constants {
 			if ($send === false) {
 				$currentUser = \OC::$server->getUserSession()->getUser()->getUID();
 				self::unshare($itemType, $itemSource, $shareType, $shareWith, $currentUser);
-				$message_t = $l->t('Sharing %s failed, could not find %s, maybe the server is currently unreachable.', array($itemSourceName, $shareWith));
+				$message_t = $l->t('Sharing %1$s failed, could not find %2$s, maybe the server is currently unreachable.', array($itemSourceName, $shareWith));
 				throw new \Exception($message_t);
 			}
 
 			return $send;
 		} else {
 			// Future share types need to include their own conditions
-			$message = 'Share type %s is not valid for %s';
-			$message_t = $l->t('Share type %s is not valid for %s', array($shareType, $itemSource));
+			$message = 'Share type %1$s is not valid for %2$s';
+			$message_t = $l->t('Share type %1$s is not valid for %2$s', array($shareType, $itemSource));
 			\OCP\Util::writeLog('OCP\Share', sprintf($message, $shareType, $itemSource), ILogger::DEBUG);
 			throw new \Exception($message_t);
 		}
@@ -1666,7 +1666,7 @@ class Share extends Constants {
 		if ($checkReshare) {
 			// Check if attempting to share back to owner
 			if ($checkReshare['uid_owner'] == $shareWith && $shareType == self::SHARE_TYPE_USER) {
-				$message = 'Sharing %s failed, because the user %s is the original sharer';
+				$message = 'Sharing %1$s failed, because the user %2$s is the original sharer';
 				$message_t = $l->t('Sharing failed, because the user %s is the original sharer', [$shareWith]);
 
 				\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $shareWith), ILogger::DEBUG);
@@ -1678,8 +1678,8 @@ class Share extends Constants {
 			// Check if share permissions is granted
 			if (self::isResharingAllowed() && (int)$checkReshare['permissions'] & \OCP\Constants::PERMISSION_SHARE) {
 				if (~(int)$checkReshare['permissions'] & $permissions) {
-					$message = 'Sharing %s failed, because the permissions exceed permissions granted to %s';
-					$message_t = $l->t('Sharing %s failed, because the permissions exceed permissions granted to %s', array($itemSourceName, $uidOwner));
+					$message = 'Sharing %1$s failed, because the permissions exceed permissions granted to %2$s';
+					$message_t = $l->t('Sharing %1$s failed, because the permissions exceed permissions granted to %2$s', array($itemSourceName, $uidOwner));
 
 					\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $uidOwner), ILogger::DEBUG);
 					throw new \Exception($message_t);
@@ -1723,9 +1723,9 @@ class Share extends Constants {
 			$result['itemSource'] = $itemSource;
 			$result['expirationDate'] = $expirationDate;
 			if (!$backend->isValidSource($itemSource, $uidOwner)) {
-				$message = 'Sharing %s failed, because the sharing backend for '
-					.'%s could not find its source';
-				$message_t = $l->t('Sharing %s failed, because the sharing backend for %s could not find its source', array($itemSource, $itemType));
+				$message = 'Sharing %1$s failed, because the sharing backend for '
+					.'%2$s could not find its source';
+				$message_t = $l->t('Sharing %1$s failed, because the sharing backend for %2$s could not find its source', array($itemSource, $itemType));
 				\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSource, $itemType), ILogger::DEBUG);
 				throw new \Exception($message_t);
 			}
diff --git a/lib/private/Share20/Manager.php b/lib/private/Share20/Manager.php
index 9497b2c263..e76269f9d8 100644
--- a/lib/private/Share20/Manager.php
+++ b/lib/private/Share20/Manager.php
@@ -735,10 +735,10 @@ class Manager implements IManager {
 			'shareWith' => $shareWith,
 		]);
 
-		$emailTemplate->setSubject($l->t('%s shared »%s« with you', array($initiatorDisplayName, $filename)));
+		$emailTemplate->setSubject($l->t('%1$s shared »%2$s« with you', array($initiatorDisplayName, $filename)));
 		$emailTemplate->addHeader();
-		$emailTemplate->addHeading($l->t('%s shared »%s« with you', [$initiatorDisplayName, $filename]), false);
-		$text = $l->t('%s shared »%s« with you.', [$initiatorDisplayName, $filename]);
+		$emailTemplate->addHeading($l->t('%1$s shared »%2$s« with you', [$initiatorDisplayName, $filename]), false);
+		$text = $l->t('%1$s shared »%2$s« with you.', [$initiatorDisplayName, $filename]);
 
 		$emailTemplate->addBodyText(
 			htmlspecialchars($text . ' ' . $l->t('Click the button below to open it.')),
@@ -754,7 +754,7 @@ class Manager implements IManager {
 		// The "From" contains the sharers name
 		$instanceName = $this->defaults->getName();
 		$senderName = $l->t(
-			'%s via %s',
+			'%1$s via %2$s',
 			[
 				$initiatorDisplayName,
 				$instanceName
diff --git a/lib/private/legacy/app.php b/lib/private/legacy/app.php
index 9c7e6001e5..4cab92eba6 100644
--- a/lib/private/legacy/app.php
+++ b/lib/private/legacy/app.php
@@ -1096,7 +1096,7 @@ class OC_App {
 		if (!empty($missing)) {
 			$missingMsg = implode(PHP_EOL, $missing);
 			throw new \Exception(
-				$l->t('App "%s" cannot be installed because the following dependencies are not fulfilled: %s',
+				$l->t('App "%1$s" cannot be installed because the following dependencies are not fulfilled: %2$s',
 					[$info['name'], $missingMsg]
 				)
 			);
diff --git a/lib/public/Federation/Exceptions/ProviderAlreadyExistsException.php b/lib/public/Federation/Exceptions/ProviderAlreadyExistsException.php
index 844d33453f..60c5b73659 100644
--- a/lib/public/Federation/Exceptions/ProviderAlreadyExistsException.php
+++ b/lib/public/Federation/Exceptions/ProviderAlreadyExistsException.php
@@ -43,7 +43,7 @@ class ProviderAlreadyExistsException extends HintException {
 	public function __construct($newProviderId, $existingProviderName) {
 		$l = \OC::$server->getL10N('federation');
 		$message = 'ID "' . $newProviderId . '" already used by cloud federation provider "' . $existingProviderName . '"';
-		$hint = $l->t('ID "%s" already used by cloud federation provider "%s"', [$newProviderId, $existingProviderName]);
+		$hint = $l->t('ID "%1$s" already used by cloud federation provider "%2$s"', [$newProviderId, $existingProviderName]);
 		parent::__construct($message, $hint);
 	}
 
diff --git a/settings/Controller/CheckSetupController.php b/settings/Controller/CheckSetupController.php
index 851644a27d..42bb473987 100644
--- a/settings/Controller/CheckSetupController.php
+++ b/settings/Controller/CheckSetupController.php
@@ -235,7 +235,7 @@ class CheckSetupController extends Controller {
 
 			if(($majorVersion === '1.0.1' && ord($patchRelease) < ord('d')) ||
 				($majorVersion === '1.0.2' && ord($patchRelease) < ord('b'))) {
-				return (string) $this->l10n->t('cURL is using an outdated %s version (%s). Please update your operating system or features such as %s will not work reliably.', ['OpenSSL', $versionString, $features]);
+				return $this->l10n->t('cURL is using an outdated %1$s version (%2$s). Please update your operating system or features such as %3$s will not work reliably.', ['OpenSSL', $versionString, $features]);
 			}
 		}
 
@@ -249,7 +249,7 @@ class CheckSetupController extends Controller {
 				$secondClient->get('https://nextcloud.com/');
 			} catch (ClientException $e) {
 				if($e->getResponse()->getStatusCode() === 400) {
-					return (string) $this->l10n->t('cURL is using an outdated %s version (%s). Please update your operating system or features such as %s will not work reliably.', ['NSS', $versionString, $features]);
+					return $this->l10n->t('cURL is using an outdated %1$s version (%2$s). Please update your operating system or features such as %3$s will not work reliably.', ['NSS', $versionString, $features]);
 				}
 			}
 		}
diff --git a/settings/templates/settings/admin/overview.php b/settings/templates/settings/admin/overview.php
index aad6ae80a7..cbb7e136da 100644
--- a/settings/templates/settings/admin/overview.php
+++ b/settings/templates/settings/admin/overview.php
@@ -50,7 +50,7 @@
 		<ul class="info hidden"></ul>
 	</div>
 	<p id="postsetupchecks-hint" class="hidden">
-		<?php print_unescaped($l->t('Please double check the <a target="_blank" rel="noreferrer noopener" href="%s">installation guides ↗</a>, and check for any errors or warnings in the <a href="%s">log</a>.', [link_to_docs('admin-install'), \OC::$server->getURLGenerator()->linkToRoute('settings.AdminSettings.index', ['section' => 'logging'])] )); ?>
+		<?php print_unescaped($l->t('Please double check the <a target="_blank" rel="noreferrer noopener" href="%1$s">installation guides ↗</a>, and check for any errors or warnings in the <a href="%2$s">log</a>.', [link_to_docs('admin-install'), \OC::$server->getURLGenerator()->linkToRoute('settings.AdminSettings.index', ['section' => 'logging'])] )); ?>
 	</p>
 
 	<p class="extra-top-margin">
diff --git a/settings/templates/settings/personal/personal.info.php b/settings/templates/settings/personal/personal.info.php
index 9919df521f..6fc8525349 100644
--- a/settings/templates/settings/personal/personal.info.php
+++ b/settings/templates/settings/personal/personal.info.php
@@ -89,7 +89,7 @@ vendor_style('jcrop/css/jquery.Jcrop');
 							<?php print_unescaped($l->t('You are using <strong>%s</strong>',
 								[$_['usage']]));?>
 						<?php else: ?>
-							<?php print_unescaped($l->t('You are using <strong>%s</strong> of <strong>%s</strong> (<strong>%s %%</strong>)',
+							<?php print_unescaped($l->t('You are using <strong>%1$s</strong> of <strong>%2$s</strong> (<strong>%3$s %%</strong>)',
 								[$_['usage'], $_['total_space'],  $_['usage_relative']]));?>
 						<?php endif ?>
 					</p>