Issue relations first commit (not thoroughly tested). 4 kinds of relation are available:

* relates to: do nothing special. Just to know that the 2 issues are related...
* duplicates: will close the related issue with the same status when closing the issue (not implemented yet)
* blocks: will require to close the blocking issue before closing the blocked issue (not implemented yet)
* precedes (end to start relation): start date of the related issue depends on the due date of the preceding issue (implemented). A delay can be set so that the related issue can only start n days after the end of the preceding issue. When setting dates for an issue, dates of all downstream issues are set according to these relations.

To set a relation, the 2 issues have to belong to the same project (may change in the future). So if an issue is moved to another project, all its relations are removed.
Circular dependencies are checked when creating a relation.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@506 e93f8b46-1217-0410-a6f0-8f06a7374b81

lang/de.yml

@@ -33,6 +33,8 @@ activerecord_error_taken: ist bereits vergeben
 activerecord_error_not_a_number: ist keine Zahl
 activerecord_error_not_a_date: ist kein gültiges Datum
 activerecord_error_greater_than_start_date: muss größer als Anfangsdatum sein
+activerecord_error_not_same_project: doesn't belong to the same project
+activerecord_error_circular_dependency: This relation would create a circular dependency
 
 general_fmt_age: %d Jahr
 general_fmt_age_plural: %d Jahre
@@ -149,6 +151,8 @@ field_activity: Aktivität
 field_spent_on: Datum
 field_identifier: Identifier
 field_is_filter: Used as a filter
+field_issue_to_id: Related issue
+field_delay: Delay
 
 setting_app_title: Applikation Titel
 setting_app_subtitle: Applikation Untertitel
@@ -364,6 +368,18 @@ label_watched_issues: Watched issues
 label_related_issues: Related issues
 label_applied_status: Applied status
 label_loading: Loading...
+label_relation_new: New relation
+label_relation_delete: Delete relation
+label_relates_to: related tp
+label_duplicates: duplicates
+label_blocks: blocks
+label_blocked_by: blocked by
+label_precedes: precedes
+label_follows: follows
+label_end_to_start: start to end
+label_end_to_end: end to end
+label_start_to_start: start to start
+label_start_to_end: start to end
 
 button_login: Einloggen
 button_submit: OK