adding a toggle for using English language

app/src/main/kotlin/com/simplemobiletools/calendar/App.kt

@@ -3,7 +3,9 @@ package com.simplemobiletools.calendar
 import android.support.multidex.MultiDexApplication
 import com.facebook.stetho.Stetho
 import com.simplemobiletools.calendar.BuildConfig.USE_LEAK_CANARY
+import com.simplemobiletools.calendar.extensions.config
 import com.squareup.leakcanary.LeakCanary
+import java.util.*
 
 class App : MultiDexApplication() {
     override fun onCreate() {
@@ -15,6 +17,12 @@ class App : MultiDexApplication() {
             LeakCanary.install(this)
         }
 
+        if (config.useEnglish) {
+            val conf = resources.configuration
+            conf.locale = Locale.ENGLISH
+            resources.updateConfiguration(conf, resources.displayMetrics)
+        }
+
         Stetho.initializeWithDefaults(this)
     }
 }

app/src/main/kotlin/com/simplemobiletools/calendar/activities/DayActivity.kt

@@ -51,6 +51,7 @@ class DayActivity : SimpleActivity(), NavigationListener, ViewPager.OnPageChange
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.menu_day, menu)
+        updateMenuTextSize(resources, menu)
         menu.findItem(R.id.filter).isVisible = eventTypeColors.size() > 1 || config.displayEventTypes.isEmpty()
         return true
     }

app/src/main/kotlin/com/simplemobiletools/calendar/activities/EventActivity.kt

@@ -465,6 +465,7 @@ class EventActivity : SimpleActivity(), DBHelper.EventUpdateListener {
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.menu_event, menu)
+        updateMenuTextSize(resources, menu)
         if (wasActivityInitialized) {
             menu.findItem(R.id.delete).isVisible = mDialogTheme != 0 && mEvent.id != 0
             menu.findItem(R.id.share).isVisible = mDialogTheme != 0 && mEvent.id != 0

app/src/main/kotlin/com/simplemobiletools/calendar/activities/MainActivity.kt

@@ -53,6 +53,7 @@ class MainActivity : SimpleActivity(), NavigationListener {
     private val PREFILLED_WEEKS = 61
 
     private var mIsMonthSelected = false
+    private var mStoredUseEnglish = false
     private var mStoredTextColor = 0
     private var mStoredBackgroundColor = 0
     private var mStoredPrimaryColor = 0
@@ -117,6 +118,11 @@ class MainActivity : SimpleActivity(), NavigationListener {
 
     override fun onResume() {
         super.onResume()
+        if (mStoredUseEnglish != config.useEnglish) {
+            restartActivity()
+            return
+        }
+
         if (mStoredTextColor != config.textColor || mStoredBackgroundColor != config.backgroundColor || mStoredPrimaryColor != config.primaryColor
                 || mStoredDayCode != Formatter.getTodayCode()) {
             updateViewPager()
@@ -143,11 +149,7 @@ class MainActivity : SimpleActivity(), NavigationListener {
 
     override fun onPause() {
         super.onPause()
-        mStoredTextColor = config.textColor
-        mStoredIsSundayFirst = config.isSundayFirst
-        mStoredBackgroundColor = config.backgroundColor
-        mStoredPrimaryColor = config.primaryColor
-        mStoredUse24HourFormat = config.use24hourFormat
+        storeStateVariables()
     }
 
     override fun onStop() {
@@ -158,9 +160,12 @@ class MainActivity : SimpleActivity(), NavigationListener {
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.menu_main, menu)
-        menu.findItem(R.id.filter).isVisible = mShouldFilterBeVisible
-        menu.findItem(R.id.go_to_today).isVisible = shouldGoToTodayBeVisible()
-        menu.findItem(R.id.refresh_caldav_calendars).isVisible = config.caldavSync
+        updateMenuTextSize(resources, menu)
+        menu.apply {
+            findItem(R.id.filter).isVisible = mShouldFilterBeVisible
+            findItem(R.id.go_to_today).isVisible = shouldGoToTodayBeVisible()
+            findItem(R.id.refresh_caldav_calendars).isVisible = config.caldavSync
+        }
         return true
     }
 
@@ -191,9 +196,13 @@ class MainActivity : SimpleActivity(), NavigationListener {
     }
 
     private fun storeStateVariables() {
-        mStoredTextColor = config.textColor
-        mStoredPrimaryColor = config.primaryColor
-        mStoredBackgroundColor = config.backgroundColor
+        config.apply {
+            mStoredUseEnglish = useEnglish
+            mStoredIsSundayFirst = isSundayFirst
+            mStoredTextColor = textColor
+            mStoredPrimaryColor = primaryColor
+            mStoredBackgroundColor = backgroundColor
+        }
         mStoredDayCode = Formatter.getTodayCode()
     }
 

app/src/main/kotlin/com/simplemobiletools/calendar/activities/SettingsActivity.kt

@@ -18,13 +18,11 @@ import com.simplemobiletools.calendar.helpers.FONT_SIZE_MEDIUM
 import com.simplemobiletools.calendar.helpers.FONT_SIZE_SMALL
 import com.simplemobiletools.calendar.models.EventType
 import com.simplemobiletools.commons.dialogs.RadioGroupDialog
-import com.simplemobiletools.commons.extensions.beGone
-import com.simplemobiletools.commons.extensions.beVisibleIf
-import com.simplemobiletools.commons.extensions.toast
-import com.simplemobiletools.commons.extensions.updateTextColors
+import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.PERMISSION_WRITE_CALENDAR
 import com.simplemobiletools.commons.models.RadioItem
 import kotlinx.android.synthetic.main.activity_settings.*
+import java.util.*
 
 class SettingsActivity : SimpleActivity() {
     private val GET_RINGTONE_URI = 1
@@ -44,6 +42,7 @@ class SettingsActivity : SimpleActivity() {
         super.onResume()
 
         setupCustomizeColors()
+        setupUseEnglish()
         setupManageEventTypes()
         setupHourFormat()
         setupSundayFirst()
@@ -84,6 +83,16 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupUseEnglish() {
+        settings_use_english_holder.beVisibleIf(config.wasUseEnglishToggled || Locale.getDefault().language != "en")
+        settings_use_english.isChecked = config.useEnglish
+        settings_use_english_holder.setOnClickListener {
+            settings_use_english.toggle()
+            config.useEnglish = settings_use_english.isChecked
+            useEnglishToggled()
+        }
+    }
+
     private fun setupManageEventTypes() {
         settings_manage_event_types_holder.setOnClickListener {
             startActivity(Intent(this, ManageEventTypesActivity::class.java))

app/src/main/res/layout/activity_settings.xml

@@ -49,6 +49,26 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_use_english_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:padding="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_use_english"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/use_english_language"/>
+
+        </RelativeLayout>
+
         <RelativeLayout
             android:id="@+id/settings_hour_format_holder"
             android:layout_width="match_parent"