Merged r12120 from trunk to 2.3-stable (#14501)

fix Russian "description_date_range_interval" translation misprint.

Contributed by Artem Kondratyev.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/2.3-stable@12122 e93f8b46-1217-0410-a6f0-8f06a7374b81