You should change that to "Latest Additions" - "Last additions" means there are no more.
Else tell me how to change mine.
Edit the language file as you wish.
Please always post a link to your gallery as per the board rules.
Please try to phrase your questions a little better. Not all supporters are native English speakers and if I had trouble understanding what you have written others might have a nightmare.
I will try to do better; the language file is what I was looking for
Thank You.