Tvheadend

Hi, its great to have internationalization now, worked on some translation for myself and its good to see its nearly at 100% some days after beginning
But i have some very little problem: Without login i see webui in german now, with newly added user account + pw same, but with my old account it stays english all the time, even if i delete account + pw...
Any idea why its not possible to get "old" account in other language? Is there some trick?
Thx