[Mediawiki-i18n] Shrinking level of MediaWiki extensions localisation

[Federico Leva (Nemo)]

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