[ticket/12530] Fix captcha challange image breaking responsive layout

PHPBB3-12530
[ticket/12530] Show logo and policy in responsive

PHPBB3-12530
[ticket/12530] Combine logo and TOS link into one

PHPBB3-12530
Merge pull request #2938 from PayBas/ticket/12530

[ticket/12530] Fix captcha challange image breaking responsive layout