[ticket/12851] Fix the Font colour button title

PHPBB3-12851
Merge pull request #2733 from n-aleha/ticket/12851

[ticket/12851] Fix the Font colour button title

* n-aleha/ticket/12851:
  [ticket/12851] Fix the Font colour button title
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12851] Fix the Font colour button title