[apps/shared] Created LocalizationController

Classes LanguageController and CountryController have been fused into
one class LocalizationController, as they were very similar. This allows
the Settings and OnBoarding apps to only keep one controller for both
functions.

Change-Id: Ic23f300c37122249d34caaf18a633b5815240a78

apps/settings/sub_menu/localization_controller.cpp

@@ -0,0 +1,13 @@
+#include "localization_controller.h"
+
+namespace Settings {
+
+bool LocalizationController::handleEvent(Ion::Events::Event event) {
+  if (Shared::LocalizationController::handleEvent(event) || event == Ion::Events::Left) {
+    static_cast<StackViewController *>(parentResponder())->pop();
+    return true;
+  }
+  return false;
+}
+
+}