Implement localization for API responses and error messages

- Added localization support for API responses in English and Spanish.
- Introduced a middleware to set the API locale based on the Accept-Language header.
- Updated various exception messages and validation responses to use localized strings.
- Created new language files for English and Spanish translations.
- Refactored existing code to replace hardcoded messages with localized strings.
- Added tests to verify localization functionality and response correctness.

app/Domains/Menu/Models/Menu.php

@@ -48,7 +48,7 @@ class Menu extends Model
                 && empty($menu->static_content_schema)
             ) {
                 throw ValidationException::withMessages([
-                    'static_content_schema' => 'El schema es obligatorio para los menús estáticos.',
+                    'static_content_schema' => __('api.menu.schema_required'),
                 ]);
             }
         });