i18n: re-sort every catalog into en.json key order

The catalogs had drifted out of en.json order as features landed keys in
different places, so an ordered insert could no longer produce a purely
additive diff. This re-sorts all 17 into en.json order.

Content is unchanged: only key order moves. Locale-only keys (the extra
plural forms ru and ar need) anchor on the first en key sharing their
plural base, keeping each plural group contiguous.

Author: giswqs