Wording improvement to sharing with groups.

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.
+  Project 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