[ticket/12042] Add all language strings from PLUpload 2.0 to the language file

PHPBB3-12042
[ticket/12042] Replace B with a more meaningful key name

PHPBB3-12042
Merge remote-tracking branch 'nickvergessen/ticket/12042' into develop

# By Joas Schilling
# Via Joas Schilling
* nickvergessen/ticket/12042:
  [ticket/12042] Replace B with a more meaningful key name
  [ticket/12042] Add all language strings from PLUpload 2.0 to the language file