Fixed #13961 - note that reverse URL lookups can't be done within a blocktrans…

Fixed #13961 - note that reverse URL lookups can't be done within a blocktrans tag. Thanks garrison for the report and richardb and zerok for work on the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15100 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/topics/i18n/internationalization.txt

@@ -500,6 +500,14 @@ apply.
 .. note:: The previous more verbose format is still supported:
    ``{% blocktrans with book|title as book_t and author|title as author_t %}``
 
+Reverse URL lookups cannot be carried out within the ``blocktrans`` and should
+be retrieved (and stored) beforehand::
+
+    {% url path.to.view arg arg2 as the_url %}
+    {% blocktrans %}
+    This is a URL: {{ the_url }}
+    {% endblocktrans %}
+
 .. _template-translation-vars:
 
 Other tags