Add dialog to restart

OsmAnd/res/values/strings.xml

@@ -9,6 +9,7 @@
          3. All your modified/created strings are in the top of the file (to make easier find what\'s translated).
     PLEASE: Have a look at http://code.google.com/p/osmand/wiki/UIConsistency, it may really improve your and our work  :-)  Thx - Hardy
     -->
+    <string name="restart_is_required">In order to apply the changes, restart of the application is required.</string>
     <string name="light_theme">Light</string>
     <string name="dark_theme">Dark</string>
     <string name="lang_pms">Piedmontese</string>

OsmAnd/src/net/osmand/plus/activities/SettingsGeneralActivity.java

@@ -438,13 +438,9 @@ public class SettingsGeneralActivity extends SettingsBaseActivity {
 		} else if (id.equals(settings.PREFERRED_LOCALE.getId())) {
 			// restart application to update locale
 			getMyApplication().checkPreferredLocale();
-			Intent intent = getIntent();
-			finish();
-			startActivity(intent);
+			restartApp();
 		} else if (id.equals(settings.OSMAND_THEME.getId())) {
-			Intent intent = getIntent();
-			finish();
-			startActivity(intent);
+			restartApp();
 		} else {
 			updateAllSettings();
 		}
@@ -453,6 +449,22 @@ public class SettingsGeneralActivity extends SettingsBaseActivity {
 
 
 
+	private void restartApp() {
+		Builder bld = new AlertDialog.Builder(this);
+		bld.setMessage(R.string.restart_is_required);
+		bld.setPositiveButton(R.string.shared_string_ok, new OnClickListener() {
+			
+			@Override
+			public void onClick(DialogInterface dialog, int which) {
+				Intent intent = getIntent();
+				finish();
+				startActivity(intent);				
+			}
+		});
+	}
+
+
+
 	private void warnAboutChangingStorage(final String newValue) {
 		String newDir = newValue != null ? newValue.trim() : newValue;
 		if(!newDir.replace('/', ' ').trim().