Most of our messages are in MediaWiki extensions. I checked the localisation stats as of now and two years ago for the extensions used on Wikimedia projects: many languages are lagging behind development, with only 14 over 90 % translated (was 40) and 22 over 80 % (was 52).* Do we need more recruitment? Some examples of affected languages: Russian went from 100 % to 80 % messages translated, pl 98 -> 80, pt 100 -> 64, hu 94 -> 67, nb 94 -> 72, cs 93 -> 77, ar 92 -> 64.
Nemo
(*) https://translatewiki.net/w/i.php?title=Translating:Group_statistics&oldid=3105979, sort by 3rd column https://translatewiki.net/w/i.php?title=Translating:Group_statistics&oldid=4791381, sort by 4th