made requested changes

app/src/main/java/chat/rocket/android/main/ui/MainActivity.kt

@@ -254,7 +254,13 @@ class MainActivity : AppCompatActivity(), MainView, HasActivityInjector,
     fun setCheckedNavDrawerItem(@IdRes item: Int) = view_navigation.setCheckedItem(item)
 
     override fun showProgress() {
-        progressDialog = ProgressDialog.show(this, getString(R.string.app_name), getString(R.string.msg_log_out), true, false)
+        progressDialog = ProgressDialog.show(
+            this,
+            getString(R.string.app_name),
+            getString(R.string.msg_log_out),
+            true,
+            false
+        )
     }
 
     override fun hideProgress() {
@@ -268,22 +274,28 @@ class MainActivity : AppCompatActivity(), MainView, HasActivityInjector,
         val builder = AlertDialog.Builder(this)
         builder.setTitle("Choose Language")
         builder.setSingleChoiceItems(languages, -1) { dialog, which ->
-            if (which == 0) {
+            when(which){
+                0->{
                     setLocale("en")
                     recreate()
-            } else if (which == 1) {
+                }
+                1->{
                     setLocale("hi")
                     recreate()
-            } else if (which == 2) {
+                }
+                2->{
                     setLocale("ja")
                     recreate()
-            } else if (which == 3) {
+                }
+                3->{
                     setLocale("ru")
                     recreate()
-            } else if (which == 4) {
+                }
+                4->{
                     setLocale("it")
                     recreate()
                 }
+            }
             dialog.dismiss()
         }
         val mdialog = builder.create()