Refactor localization system and migrate to Fyne's built-in support

Replaced the `i18n` and `toml` dependencies with Fyne's built-in language system for localization management. Updated the `Localizer` implementation to handle translations using JSON files and embed functionality. Simplified language selection and persisted settings via Fyne's preferences API.

kernel/app.go

@@ -30,7 +30,6 @@ type App struct {
 
 func NewApp(
 	metadata *fyne.AppMetadata,
-	localizerService LocalizerContract,
 	queue QueueListContract,
 	ffplayService FFplayContract,
 	convertorService ConvertorContract,
@@ -38,6 +37,12 @@ func NewApp(
 	app.SetMetadata(*metadata)
 	a := app.New()
 
+	localizerService, err := newLocalizer(a)
+	if err != nil {
+		panicErrorLang(a, err)
+		return nil
+	}
+
 	statusesText := GetBlockProgressbarStatusesText(localizerService)
 	blockProgressbarService := NewBlockProgressbar(statusesText, ffplayService)
 	rightTabsService := NewRightTabs(localizerService)