feat: Themed language screen (#1020)

## Summary

Added theme support to the language screen

![IMG_8139
Medium](https://github.com/user-attachments/assets/08fe06b4-d8ed-41fe-9584-8b90488eebae)


## Additional Context

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### AI Usage

Did you use AI tools to help write this code? _**NO**_

src/activities/settings/LanguageSelectActivity.h

@@ -7,6 +7,7 @@
 
 #include "../ActivityWithSubactivity.h"
 #include "components/UITheme.h"
+#include "util/ButtonNavigator.h"
 
 class MappedInputManager;
 
@@ -28,6 +29,7 @@ class LanguageSelectActivity final : public Activity {
   void handleSelection();
 
   std::function<void()> onBack;
+  ButtonNavigator buttonNavigator;
   int selectedIndex = 0;
   int totalItems = 0;
 };