Language override on profile page.

Hi,

I'm trying to override the text "friends" on the profile page. On two places:

In the sidebar.
In the users meta

(see also the attachment). I marked the text I'm referring to with a red square.
For these two I was not able to locate the constant. Is this text maybe hard coded, if so where can I find the correct file?

Thanks in advance!

Greetings,
Danny