feat(i18n): add update flag strategy settings

Add new "updateFlags" section to settings navigation and implement update flag strategy configuration. The strategy allows users to choose when update badges appear:
- Match updates by base model (only show when new release shares same base model)
- Flag any available update (show whenever newer version exists)

Includes translations for English, German, Spanish, and French locales.

py/services/base_model_service.py

@@ -271,7 +271,7 @@ class BaseModelService(ABC):
         if isinstance(strategy_value, str) and strategy_value.strip():
             strategy = strategy_value.strip().lower()
         else:
-            strategy = "any"
+            strategy = "same_base"
         same_base_mode = strategy == "same_base"
 
         records = None