feat(localization): Implement Swedish localization and error messages

- Added localization support for Swedish and English languages.
- Integrated localized strings for user messages in the API error mapper.
- Updated UI components to use localized strings for labels and messages.
- Ensured all error messages are context-aware and utilize the localization framework.
- Created regression test to prevent common ASCII fallbacks in Swedish UI text.

flutter/lib/features/recipes/presentation/recipes_screen.dart

@@ -16,7 +16,7 @@ class RecipesScreen extends ConsumerWidget {
       body: recipesAsync.when(
         loading: () => const LoadingStateView(label: 'Laddar recept...'),
         error: (error, _) => ErrorStateView(
-          message: mapErrorToUserMessage(error),
+          message: mapErrorToUserMessage(error, context),
           onRetry: () => ref.invalidate(recipesProvider),
         ),
         data: (recipes) {