Hello,
https://gyazo.com/be720dba270ffc9e86e951f12d0cb3cb – delete your current Deutsch translation, and then rename xstore-core-de.po to xstore-core-de_DE.po Sync transaltion after that – https://xstore.helpscoutdocs.com/article/103-translation-files-update Do the same for the translation of the theme.
P.S. You do not need all plugins that come bundled with the theme, read description of plugins and activate required ones. Every plugin slows down site a bit, so there is no need to activate plugins that you do not plan to use.
Regards
