Change text on icon loginbox

Is it possible to change the text on a button in from the loginbox in JA Social II?
For example, I want to change this text ('conversations) into something else:



Normally I change these settings in the default languagefile, but in this case it's not in there.
How and where do I change this?

I've changed a setting under the template JA Social II in file 'en-GB.tpl_ja_social_ii.ini'



I've change 'conversations' to 'messages', but still this doesn't change the site....

--Jan