update locales for 2.5

[pkra]

fixes #922

[pkra]

TODO: update MathJax.js's list of locales.

[pkra]

Do we want to make a cut at some percentage of translation (cf https://translatewiki.net/w/i.php?title=Special:MessageGroupStats&group=out-mathjax-0-all#sortable:3=desc)?

The only mis-represented one is probably en-GB...

[pkra]

Ok, it seems 2.3 originally added every language (and either we didn't have new languages or we didn't check for 2.4).

Moving forward, I think a threshold of 50% or 66.6% is sensible. Either of these would mean adding one language (sco) to MathJax.js (the next new one is bcc at 39%).

@dpvc what do you think?

[dpvc]

I thought that we had used something like 25% in the past, but I'm OK with whatever cut-off you want.

[pkra]

Ah ok, 25% would only add bcc (and of course sco) so that's ok with me. (For the record, ia is at 22% and cdo is at 5%, both included so at least 2.3 must have added every language). A special case is en-gb -- it's at 3% but it might be complete (e.g., color/colour, recognize/recognise)

Anyway, I'll update the pull request with these two additions to MathJax.js. I'll have to figure out their plural rules.

[pkra]

=> Ready to merge.

(For the record, I couldn't find information on the plural of BCC so I went with the default which both Kurdish and Farsi use.)