Languages in Gramps. How many?

I’m afraid to disrupt work of code.
I will change FAQ and Wiki, not code.
43 + 1. In future all .po files must have more 70% translated words. I hope in this.

And one question please.
You wrote to me about “My first Pull request (#1074)”:

I have rebased and merged this manually. I did combine a few of the ru.po file commits into a single commit.
In the future, it would be best to keep to one topic per PR; these were in a lot of different subject areas. Although you correctly kept it to one topic per commit. This will make it easier for us to review, and will avoid the possibility that we would reject your PR because we were not ready to accept a single part of your PR.

What I must for work on rule “One commit - one PR”?
GitHub add all my commits in one PR in auto mode. I try create PR and close. I lose my PR.
I think - I must create new PR, developer must test my PR and close.
Then I can create new PR.
P.S. I change INSTALL file, create PR. Then try resolve this
https://gramps-project.org/bugs/view.php?id=11813
And two my commits joined to one PR again…