[ticket/13068] Language correction in FIELD_IS_CONTACT_EXPLAIN

PHPBB3-13068
Merge remote-tracking branch 'GiampaoloFalqui/develop-ascraeus' into develop-ascraeus

* GiampaoloFalqui/develop-ascraeus:
  [ticket/13068] Language correction in FIELD_IS_CONTACT_EXPLAIN
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/13068] Language correction in FIELD_IS_CONTACT_EXPLAIN