Hi!
On this page getk2.org/extend/translations it says that "This is a list of all the available language packs for the latest version of K2. The language packs are fully compatible for installation in Joomla! versions 1.5 to 2.5.". I have installed Joomla 3.0. Is there any language pack available for K2 for Joomla 3.0? I am searching for a Romanian pack.
Thank you!

There are no differences between 2.5 and 3.0 as far as the language files for K2 is concerned. You can download and install 2.5 language file for Romanian.