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.
This commit removes outdated dependencies and adds updated versions of required modules in the `go.sum` file. The changes ensure the project uses the latest compatible releases, improving stability and maintaining compatibility with current updates.
