Search engine: issue custom fields can now be searched.

Each issue custom field (excepting numeric, date and boolean fields) can be marked as "Searchable" (default to false).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@994 e93f8b46-1217-0410-a6f0-8f06a7374b81

lang/en.yml

@@ -170,6 +170,7 @@ field_redirect_existing_links: Redirect existing links
 field_estimated_hours: Estimated time
 field_column_names: Columns
 field_time_zone: Time zone
+field_searchable: Searchable
 
 setting_app_title: Application title
 setting_app_subtitle: Application subtitle