When I published the item, after the tittle goes "written by", on English but I want my language there, and also down where is written "comments" and "be the first to comment".Where I can change there, I was searching in k2 files, but there are too many of them?Thanks.

Hey there, you should find what you need in:

en-GB.com_k2.ini
en-GB.mod_k2_comments.ini
en-GB.mod_k2_content.ini
en-GB.mod_k2_login.ini
en-GB.mod_k2_tools.ini

This files are in your english language folder.

Great, thanks! :D