[ticket/12451] Fix whitespace in posting.php lang file

PHPBB3-12451
Merge pull request #2442 from Elsensee/ticket/12451-2

[ticket/12451] Fix whitespace in posting.php lang file

* Elsensee/ticket/12451-2:
  [ticket/12451] Fix whitespace in posting.php lang file
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12451] Fix whitespace in posting.php lang file