Implement localization

app.go

@@ -125,3 +125,15 @@ func (a *App) SelectDirectory() (res StringResponse) {
 	res.Data = path
 	return
 }
+
+func (a *App) GetLocale() string {
+	if settings.Locale == "" {
+		return "en"
+	}
+	return settings.Locale
+}
+
+func (a *App) SetLocale(locale string) error {
+	settings.Locale = locale
+	return SaveSettings(*settings)
+}