Updated mediawiki/extensions
Project: mediawiki/extensions/Translate  60ef2227c23ba2d548eba6c56149c66cae7d7ab9
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Avoid doing two calls to messagegroups api

Storing the data in a promise in the prototype now since
I don't know a better place. I don't like how the data
is stored many times in different places.

Change-Id: I60b78b6d90dd121c5f84500778778de30bcb4fa4