[apps] Don't forget to call viewWillAppear

At the moment ViewController::viewWillAppear doesn't do anything, so
there is no real impact. But if we want to use it it needs to be called
from subclasses.

apps/shared/language_controller.cpp

@@ -35,6 +35,7 @@ void LanguageController::didBecomeFirstResponder() {
 }
 
 void LanguageController::viewWillAppear() {
+  ViewController::viewWillAppear();
   resetSelection();
 }