Merge pull request #1989 from nickvergessen/ticket/12151

[ticket/12151] Remove old dependency from profile type in tests
[ticket/12115] Convert user occupation to a profile field

PHPBB3-12115
[ticket/12115] Add language entries for the profile fields

PHPBB3-12115
[ticket/12115] Remove occupation field from html files

PHPBB3-12115
[ticket/12115] Translate profile field name before displaying it in errors

PHPBB3-12115
[ticket/12115] Add methods to interface

PHPBB3-12115
[ticket/12115] Remove old language strings

PHPBB3-12115
[ticket/12115] Also port user interests to profile fields

PHPBB3-12115