Fixed #15632 -- Ignore unrelated content in template multi-line comment blocks...

Fixed #15632 -- Ignore unrelated content in template multi-line comment blocks when looking for tokens that identify comments for translators. Thanks andrew AT ie-grad DOT ru for the report and Claude Paroz for spotting the problem and helping to fix it.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15882 bcc190cf-cafb-0310-a4f2-bffc1f526a37