server/settings/templates/users/part.setquota.php

<div id="app-settings-header">
	<button class="settings-button" tabindex="0" data-apps-slide-toggle="#app-settings-content"></button>
</div>
<div id="app-settings-content">
	<div class="quota">
		<!-- Default storage -->
		<span><?php p($l->t('Default Quota'));?></span>
		<?php if((bool) $_['isAdmin']): ?>
			<select id='default_quota' data-inputtitle="<?php p($l->t('Please enter storage quota (ex: "512 MB" or "12 GB")')) ?>">
				<option <?php if($_['default_quota'] === 'none') print_unescaped('selected="selected"');?> value='none'>
					<?php p($l->t('Unlimited'));?>
				</option>
				<?php foreach($_['quota_preset'] as $preset):?>
					<?php if($preset !== 'default'):?>
						<option <?php if($_['default_quota']==$preset) print_unescaped('selected="selected"');?> value='<?php p($preset);?>'>
							<?php p($preset);?>
						</option>
					<?php endif;?>
				<?php endforeach;?>
				<?php if($_['defaultQuotaIsUserDefined']):?>
					<option selected="selected" value='<?php p($_['default_quota']);?>'>
						<?php p($_['default_quota']);?>
					</option>
				<?php endif;?>
				<option data-new value='other'>
					<?php p($l->t('Other'));?>
					...
				</option>
			</select>
		<?php endif; ?>
		<?php if((bool) !$_['isAdmin']): ?>
			<select class='quota' disabled="disabled">
				<option selected="selected">
					<?php p($_['default_quota']);?>
				</option>
			</select>
		<?php endif; ?>
	</div>
</div>