Update lang.ru.php

Add MAIL Words
Update mail.inc.php

fix
Merge branch 'master' of https://github.com/dima-bzz/hd.rustem into dima-bzz-patch-5

# By dima-bzz
# Via dima-bzz
* 'master' of https://github.com/dima-bzz/hd.rustem:
  Update mail.inc.php
  Update lang.ru.php
Merge branch 'master' of https://github.com/rustem-art/hd.rustem into dima-bzz-patch-5

# By dima-bzz
# Via Yasroslav Snisar (1) and dima-bzz (1)
* 'master' of https://github.com/rustem-art/hd.rustem:
  fix
Merge branch 'dima-bzz-patch-5'

* dima-bzz-patch-5:
  Update mail.inc.php
  Update lang.ru.php