Translate Widget Title

Hi,

I would like to translate the title of the Theme My Login Widget.
I checked the .po file and looked to “Login”, which is the title of the widget but I didn’t succeed to find. There are “Log in” but they refer to other texts, like the dropdown of the widget. I think this must be hard coded in some php file.
Since I don’t know very much of PHP I am a bit insecure to change, unless you tell me which file and line to change.
I want to change the widget title from LOGIN to the equivalent in portughese of “Restricted Area”.
Thanks for this wonderful plugin.