Merge pull request #4332 from zeroadam/DfrnPollL10nFix

Dfrn_Poll Missing use

mod/dfrn_poll.php

@@ -5,6 +5,7 @@
  */
 use Friendica\App;
 use Friendica\Core\Config;
+use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Module\Login;