Should be changed to " Mio/s" (and l. 535 to " Kio/s") as MT divides measurements by 1024 (1, 2) and not 1000. (Same should be done in English BTW)

I was planning to do this, but wasn't sure whether Minetest counted in binary or decimal prefix.

This will probably be fixed in a later pull request (when there are enough new strings for one).