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.

convertor/view_setting.go

@@ -6,7 +6,6 @@ import (
 	"fyne.io/fyne/v2/container"
 	"fyne.io/fyne/v2/storage"
 	"fyne.io/fyne/v2/widget"
-	"github.com/nicksnyder/go-i18n/v2/i18n"
 	"image/color"
 	"net/url"
 	"path/filepath"
@@ -37,33 +36,25 @@ func (v View) SelectFFPath(
 	form := &widget.Form{
 		Items: []*widget.FormItem{
 			{
-				Text: v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
-					MessageID: "titleDownloadLink",
-				}),
+				Text:   v.app.GetLocalizerService().GetMessage("titleDownloadLink"),
 				Widget: link,
 			},
 			{
-				Text: v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
-					MessageID: "pathToFfmpeg",
-				}),
+				Text:   v.app.GetLocalizerService().GetMessage("pathToFfmpeg"),
 				Widget: buttonFFmpeg,
 			},
 			{
 				Widget: container.NewHScroll(buttonFFmpegMessage),
 			},
 			{
-				Text: v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
-					MessageID: "pathToFfprobe",
-				}),
+				Text:   v.app.GetLocalizerService().GetMessage("pathToFfprobe"),
 				Widget: buttonFFprobe,
 			},
 			{
 				Widget: container.NewHScroll(buttonFFprobeMessage),
 			},
 			{
-				Text: v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
-					MessageID: "pathToFfplay",
-				}),
+				Text:   v.app.GetLocalizerService().GetMessage("pathToFfplay"),
 				Widget: buttonFFplay,
 			},
 			{
@@ -73,9 +64,7 @@ func (v View) SelectFFPath(
 				Widget: errorMessage,
 			},
 		},
-		SubmitText: v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
-			MessageID: "save",
-		}),
+		SubmitText: v.app.GetLocalizerService().GetMessage("save"),
 		OnSubmit: func() {
 			err := save(*ffmpegPath, *ffprobePath, *ffplayPath)
 			if err != nil {
@@ -85,13 +74,9 @@ func (v View) SelectFFPath(
 	}
 	if cancel != nil {
 		form.OnCancel = cancel
-		form.CancelText = v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
-			MessageID: "cancel",
-		})
+		form.CancelText = v.app.GetLocalizerService().GetMessage("cancel")
 	}
-	selectFFPathTitle := v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
-		MessageID: "selectFFPathTitle",
-	})
+	selectFFPathTitle := v.app.GetLocalizerService().GetMessage("selectFFPathTitle")
 
 	if v.downloadFFmpeg.blockDownloadFFmpegContainer == nil {
 		v.downloadFFmpeg.blockDownloadFFmpegContainer = v.blockDownloadFFmpeg(donwloadFFmpeg)
@@ -110,9 +95,7 @@ func (v View) getButtonSelectFile(path string) (filePath *string, button *widget
 	buttonMessage.TextSize = 16
 	buttonMessage.TextStyle = fyne.TextStyle{Bold: true}
 
-	buttonTitle := v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
-		MessageID: "choose",
-	})
+	buttonTitle := v.app.GetLocalizerService().GetMessage("choose")
 
 	var locationURI fyne.ListableURI
 	if len(path) > 0 {