[COMMITTED PATCH 1/2] tt_RU: Fix orthographic mistakes in mon and abmon sections [BZ #24369]

[Florian Weimer]

* Rafal Luzynski:

> Guys, what do you think about backporting this patch to some stable
> branches?  2.29?  2.28?  Other?  The fix seems important to me because
> according to my knowledge the old month names were not Tatar at all
> but Russian and in genitive case (a concept totally unknown in Tatar).

I'm not sure if changing the width of the abbreviated month names in a
stable release is totally risk-free.  I'm not sure if we have a way to
poll users of the locale, to dtermine potential impact.

Thanks,
Florian