feat: Remove duplicated English localization messages

messages/en.json

@@ -383,19 +383,8 @@
 	"reminder_status_error": "Unable to update reminder status.",
 	"reminder_toast_error_fallback": "Failed to save reminder.",
 	"settings_sheet_title": "Settings",
-	"settings_features_intro": "Enable or disable features to customize your experience",
-	"feature_label_fuel": "Fuel Log",
-	"feature_desc_fuel": "Track and manage fuel consumption and refueling history",
-	"feature_label_maintenance": "Maintenance",
-	"feature_desc_maintenance": "Record and schedule vehicle maintenance activities",
 	"feature_label_pollution": "Pollution",
 	"feature_desc_pollution": "Manage Pollution Under Control Certificate records",
-	"feature_label_reminders": "Reminders",
-	"feature_desc_reminders": "Set and receive reminders for important vehicle events",
-	"feature_label_insurance": "Insurance",
-	"feature_desc_insurance": "Manage vehicle insurance details and renewals",
-	"feature_label_overview": "Overview",
-	"feature_desc_overview": "Display overview dashboard with key vehicle metrics",
 	"profile_menu_item": "Profile",
 	"profile_sheet_title": "Profile",
 	"profile_sheet_desc": "Update your username and password",
@@ -414,12 +403,6 @@
 	"data_export_import_sheet_title": "Data Export/Import",
 	"data_export_import_sheet_desc": "Export or import your database with optional encryption",
 	"logout_menu_item": "Logout",
-	"nav_overview": "Overview",
-	"nav_fuel_logs": "Fuel Logs",
-	"nav_maintenance": "Maintenance",
-	"nav_insurance": "Insurance",
-	"nav_pollution": "Pollution",
-	"nav_reminders": "Reminders",
 	"custom_fields_label": "Custom Fields",
 	"custom_fields_add_button": "Add Field",
 	"custom_fields_name_placeholder": "Field name",