Merge branch 'add-other-to-sharing-to-make-this-clear' into 'master'

Add other to sharing to make this clear

See my comments in https://dev.gitlab.org/gitlab/gitlab-ee/merge_requests/118

app/views/projects/group_links/index.html.haml

-%h3.page_title Share project with groups
+%h3.page_title Share project with other groups
 %p.light
-  Project can be stored in one group at once. However you can share project with other groups here.
+  Projects can be stored in only one group at once. However you can share a project with other groups here.
 %hr
 - if @group_links.present?
   .enabled-groups.append-bottom-20