Make the mod localizable

Andrei Kortunovrequested to merge
akortunov/lua-multimark:l10n into master

Summary of changes:

  1. Use an OpenMW's l10n API instead of string literals
  2. Add a Russian translation
  3. Use a regions API instead of region IDs (which are English-only) for marks in unnamed exterior cells
  4. Add a support for multibyte characters when erasing characters from mark name via Backspace button

Note that that the renaming function itself is semi-broken due to its implementation, but it is an another issue.

Also I did not touch BA2 archives, I do not know if they are still used to deploy this mod.

screenshot022

Edited by Andrei Kortunov

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