[ticket/12376] Add template events viewtopic_body_polls

PHPBB3-12376
[ticket/12376] Added viewtopic_body_poll_question_append

PHPBB3-12376
[ticket/12376] Changed to viewtopic_body_poll_option_before and after

PHPBB3-12376
Merge pull request #2273 from PayBas/ticket/12376

[ticket/12376] Add template events viewtopic_body_polls

* PayBas/ticket/12376:
  [ticket/12376] Changed to viewtopic_body_poll_option_before and after
  [ticket/12376] Added viewtopic_body_poll_question_append
  [ticket/12376] Add template events viewtopic_body_polls