change language file for post onto jomsocial (v4.0.5) activity stream

Hi,
I am running jomsocial, and easyblog and Alpha user points (all latest versions at the time or writing).
I wish to locate the language file so that I can change the message that is displayed which shows the action and points rewarded ( by AUP) on the jomsocial activity stream when a user writes, or edits a blog post.
If you see my screenshot attached - I need to change the text 'Action: 'Easyblog write new blog'

Hopefully you can you assist as I'm getting nowhere with the jomsocial support.

thanks,
Tom.