Changing name on notifications

[ano2k77]

Right, this may sound a bit confusing but I'll try to explain as best as I can, I installed the post thanks plugin to my forum and also installed recent_thanks so that when your post gets liked, you get a notification for it... However when you open the notifications popup - the title of the notification says "New "Thanks" on your post" - how would I go about changing this title etc to "New Like on your post" - I've done this before but I can't honestly remember how I did it, because it was that long ago.

http://prntscr.com/i9ok35 - here is a screenshot of what I mean and what I'm trying to change text of

Any help would be much appreciated