Translation of MasterHead and Logon screen

Hi Gurus,

Currently I translate a portal to romanian language. But I have a serious problem. I can't find the source of the logon screen's texts (Welcome, Login, Password ect.) and I am not able to translate the MasterHead iView. ( Welcome, Help, Log off ect.)

I already wanted to use the standard content translation tool to translate the main template of Masterhead, but I can't find the text inside.

Do you have any idea, where to find the source? UME?

Best,

Levente