[Task] Add DI dependency injection for missing parts

> A long time ago, we used Template Studio to create the App project. Although its code seems very outdated to us now (as it hasn't been updated for a long time), the structure within the template was great! It built a solid foundation capable of supporting large-scale projects. However, while refactoring AutoDarkMode, in our pursuit of speed, we hardly followed the DI and MVVM patterns. That is why I am starting to modify things now—to make the project more robust, moving from "functional" to "well-crafted." Bringing these non-standard elements into alignment with best practices will be much better for the project's future development.

In this issue, it is used to track the part that should have been implemented by DI injection.

- [ ] App/Helpers/LanguageHelper [Change to LanguageService]
- [ ] App/Services/GeolocatorService

And find a better way to use IErrorService.