[notification] use an InternalManager object for notifications if we have an (email, lang) tuple The non-uniform handling of CWUser vs (email, lang) tuple has caused too many bugs; this change mostly unifies the two code paths. Closes #3381521

option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')