Added an option to be able to relate issues in different projects.

It can be set in Admin -> Settings (default: false).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@620 e93f8b46-1217-0410-a6f0-8f06a7374b81

lang/es.yml

@@ -173,6 +173,7 @@ setting_commit_ref_keywords: Referencing keywords
 setting_commit_fix_keywords: Fixing keywords
 setting_autologin: Autologin
 setting_date_format: Date format
+setting_cross_project_issue_relations: Allow cross-project issue relations
 
 label_user: Usuario
 label_user_plural: Usuarios