[ticket/11789] Remove colors from HTML code

PHPBB3-11789
Merge remote-tracking branch 'cyberalien/ticket/11789' into develop-olympus

* cyberalien/ticket/11789:
  [ticket/11789] Remove colors from HTML code
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11789] Remove colors from HTML code

Conflicts:
	phpBB/styles/subsilver2/template/ucp_pm_history.html