Fixed #10959 -- Changed the admin search button text to make it clearer in the...

Fixed #10959 -- Changed the admin search button text to make it clearer in the UI, and to disambiguate during translation. Thanks to Ramiro Morales for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10678 bcc190cf-cafb-0310-a4f2-bffc1f526a37