Added an administration setting to allow issue start date to be defaulted to blank (nil) at issue creation (#2269).

Based on the patch of #2277 contributed by Mischa The Evil.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7733 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/locales/ca.yml

@@ -1003,3 +1003,4 @@ ca:
   label_parent_revision: Parent
   label_child_revision: Child
   error_scm_annotate_big_text_file: The entry cannot be annotated, as it exceeds the maximum text file size.
+  setting_default_issue_start_date_to_creation_date: Set new issue's start date with today's date value