Hi,
im Files&Images section, there' a button called

+ Add files to "{here comes folder's name}"

My client uses polish user interface in admin section, so instead he sees partially translated button which replaced "Add" with polish "Dodaj" but left files to unchanged.

Where can i modify this ?

Thanx
Qlex

EDIT:
Found this myself. Please close topic. For your information, the following was missing in the lang file for pl_PL in dataobject_manager/lang/
$lang['en_US']['AssetManager']['ADDFILESTO'] = 'files to "%s"';