adding a switch for forcing english language

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

@@ -29,6 +29,7 @@ class MainActivity : SimpleActivity() {
     private var mBus: Bus? = null
     private var mCameraImpl: MyCameraImpl? = null
     private var translucentWhite = 0
+    private var mStoredUseEnglish = false
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -49,10 +50,16 @@ class MainActivity : SimpleActivity() {
         }
 
         setupStroboscope()
+        storeStateVariables()
     }
 
     override fun onResume() {
         super.onResume()
+        if (mStoredUseEnglish != config.useEnglish) {
+            restartActivity()
+            return
+        }
+
         mCameraImpl!!.handleCameraSetup()
         checkState(MyCameraImpl.isFlashlightOn)
 
@@ -74,6 +81,11 @@ class MainActivity : SimpleActivity() {
         }
     }
 
+    override fun onPause() {
+        super.onPause()
+        storeStateVariables()
+    }
+
     override fun onStop() {
         super.onStop()
         mBus!!.unregister(this)
@@ -98,6 +110,12 @@ class MainActivity : SimpleActivity() {
         return true
     }
 
+    private fun storeStateVariables() {
+        config.apply {
+            mStoredUseEnglish = useEnglish
+        }
+    }
+
     private fun launchSettings() {
         startActivity(Intent(applicationContext, SettingsActivity::class.java))
     }