German GUI missing in SDL Passolo 2016 CU12 (Build 408, Published on 14 March 2018)

I have just updated from SDL Passolo 2016 Build 391 to SDL Passolo 2016 CU12 (Build 408, Published on 14 March 2018). After that I am unable to change the GUI language to German. Only English is available, German is grayed out.
Will there be a fix to enable German again?

TIA Andreas