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.

main.go

@@ -10,7 +10,6 @@ import (
 	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/menu"
 	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/setting"
 	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/theme"
-	"golang.org/x/text/language"
 )
 
 var application kernel.AppContract
@@ -25,12 +24,6 @@ func init() {
 		Icon:    iconResource,
 	}
 
-	localizerService, err := kernel.NewLocalizer("languages", language.Russian)
-	if err != nil {
-		kernel.PanicErrorLang(err, appMetadata)
-		return
-	}
-
 	ffPathUtilities = &kernel.FFPathUtilities{FFmpeg: "", FFprobe: "", FFplay: ""}
 	convertorService := kernel.NewService(ffPathUtilities)
 	ffplayService := kernel.NewFFplay(ffPathUtilities)
@@ -38,7 +31,6 @@ func init() {
 	queue := kernel.NewQueueList()
 	application = kernel.NewApp(
 		appMetadata,
-		localizerService,
 		queue,
 		ffplayService,
 		convertorService,
@@ -71,12 +63,11 @@ func main() {
 	themeRepository := theme.NewRepository(settingRepository)
 	themeService := theme.NewTheme(application, themeRepository)
 
-	localizerRepository := localizer.NewRepository(settingRepository)
 	menuView := menu.NewView(application)
 	menuSettingView := menu.NewViewSetting(application, themeService)
-	mainMenu := handler.NewMenuHandler(application, convertorHandler, menuView, menuSettingView, localizerView, localizerRepository, themeService)
+	mainMenu := handler.NewMenuHandler(application, convertorHandler, menuView, menuSettingView, localizerView, themeService)
 
-	mainHandler := handler.NewMainHandler(application, convertorHandler, mainMenu, localizerRepository)
+	mainHandler := handler.NewMainHandler(application, convertorHandler, mainMenu)
 	mainHandler.Start()
 
 	application.GetWindow().SetMainMenu(mainMenu.GetMainMenu())