Wrap user-visible strings in _() for localization
Update user-visible texts from current Zusi translation
Add translation template file and German translation
Translate remaining strings and load German translation by default
Update README to reflect translation
Fix tests and always write animation names in German
Remove unnecessary print statement
Make export and import tests pass on Windows
Fix idname properties of export/import operators
Make paths relative to the Zusi data directory if possible
Fix i18n of 'Successfully exported %d files' message
Display list of files to be overwritten when exporting animations
Make the tests pass again