Ticket #3233: mceditor: translate language names in the spelling assistant dialogue.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
Update po/*.po files.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
Merge branch '3233_spell_names_i18n'

* 3233_spell_names_i18n:
  Update po/*.po files.
  Ticket #3233: mceditor: translate language names in the spelling assistant dialogue.