adding a toggle for using english

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

@@ -44,6 +44,8 @@ class MainActivity : SimpleActivity(), MyCanvas.PathsChangedListener {
     private var isEraserOn = false
     private var isImageCaptureIntent = false
 
+    private var storedUseEnglish = false
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
@@ -64,10 +66,16 @@ class MainActivity : SimpleActivity(), MyCanvas.PathsChangedListener {
 
         checkIntents()
         checkWhatsNewDialog()
+        storeStateVariables()
     }
 
     override fun onResume() {
         super.onResume()
+        if (storedUseEnglish != config.useEnglish) {
+            restartActivity()
+            return
+        }
+
         val isStrokeWidthBarEnabled = config.showBrushSize
         stroke_width_bar.beVisibleIf(isStrokeWidthBarEnabled)
         my_canvas.setIsStrokeWidthBarEnabled(isStrokeWidthBarEnabled)
@@ -78,6 +86,7 @@ class MainActivity : SimpleActivity(), MyCanvas.PathsChangedListener {
         super.onPause()
         config.brushColor = color
         config.brushSize = strokeWidth
+        storeStateVariables()
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
@@ -106,6 +115,10 @@ class MainActivity : SimpleActivity(), MyCanvas.PathsChangedListener {
         return true
     }
 
+    private fun storeStateVariables() {
+        storedUseEnglish = config.useEnglish
+    }
+
     private fun launchSettings() {
         startActivity(Intent(applicationContext, SettingsActivity::class.java))
     }

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

@@ -1,10 +1,13 @@
 package com.simplemobiletools.draw.activities
 
 import android.os.Bundle
+import com.simplemobiletools.commons.extensions.beVisibleIf
 import com.simplemobiletools.commons.extensions.updateTextColors
+import com.simplemobiletools.commons.extensions.useEnglishToggled
 import com.simplemobiletools.draw.R
 import com.simplemobiletools.draw.extensions.config
 import kotlinx.android.synthetic.main.activity_settings.*
+import java.util.*
 
 class SettingsActivity : SimpleActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -16,6 +19,7 @@ class SettingsActivity : SimpleActivity() {
         super.onResume()
 
         setupCustomizeColors()
+        setupUseEnglish()
         setupBrushSize()
         updateTextColors(settings_holder)
     }
@@ -26,6 +30,16 @@ 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 setupBrushSize() {
         settings_show_brush_size.isChecked = config.showBrushSize
         settings_show_brush_size_holder.setOnClickListener {

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

@@ -30,6 +30,26 @@
 
         </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_show_brush_size_holder"
             android:layout_width="match_parent"