[ticket/13009] Remove legacy browser hacks

PHPBB3-13009
[ticket/13058] Add min value to jump to page input

PHPBB3-13058
Merge remote-tracking branch 'Nicofuma/ticket/13058' into develop-ascraeus

* Nicofuma/ticket/13058:
  [ticket/13058] Add min value to jump to page input
Merge remote-tracking branch 'hanakin/ticket/13009' into develop-ascraeus

* hanakin/ticket/13009:
  [ticket/13009] Remove legacy browser hacks
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/13058] Add min value to jump to page input
  [ticket/13009] Remove legacy browser hacks