plesk customer and business manager language problem

[mr_exclusive]

Hi,

i just installed plesk 11.0.9 with customer and business manager
when i go into customer and business manager -> administation and try to change language to German or French it changes without any problems, but when i pick Polish language it swiches to english (but showing selected langage as pl - Polish)
is that some kind of bug?

can someone help what could be wrong?

Regards.