Failgod (from these very forums) has graciously provided German translations for card text and several bits of the UI; if you can read German, please check it out and let me know if it's working! There's a new dropdown at the top that lets you choose between languages, but it will attempt to identify what language you prefer.
http://geordanr.github.io/xwing/
Additional UI translation is forthcoming, but hopefully the translated card text will be helpful enough for our German players.
As always, comments, suggestions, and bug reports welcome; several changes were made to the code to add multi-language support, so it's very likely that bugs have been introduced.