[ticket/13080] Remove nowrap from dd in responsive

PHPBB3-13080
[ticket/13080] Fix mediaqueries formating

open { are should not to be on new lines for
media queries per spec, causes code highlight
issues in reputible code editors

PHPBB3-13080
Merge pull request #2974 from hanakin/ticket/13080

[Ticket/13080] Fix text overflow issue in mobile