Examine the existing localization resource files (typically .resx files) in the project, for example under a 'Resources' directory. Identify the pattern used for other languages (e.g., en, fr) and replicate it for German (de). Translate the UI strings accordingly. Check if there is a contributing guide or documentation on adding localizations. The repository likely uses ASP.NET Core localization, so ensure the new resource file is registered correctly.
