Q&A Language File Difficulty - Editing po file

Hi, I've read the threads on this topic and I'm still having difficulty.

I've edited my qa/languages/qa.po file and generated the mo file, renamed the mo file to ga-en_US.mo and uploaded it to qa/languages/ga-en_US.mo

It isn't clear to me if I am to leave the po file in the directory WITH the mo file, or to only leave the mo file. I have tried both.

When I test, I make sure to logout the member and clear cookies/history, then log back in.

I don't get my expected changes.

I'm attempting to edit the "QA Rep" points to "QA Reputation Points" for aesthetic and clarity reasons.

2 Screengrabs attached.

Are my steps correct? Any help will be appreciated!

James