Allow User Imports to specify language. Tweak IFRC Roles/menus/User Prepop
LocationSelector can have postcode disabled. Volunteer Availability
(simple dropdown). Fixes for IS_ONE_OF with a None in filter_opts &
s3forms. Migrate hrm_training to S3Filter/S3Report2. Volunteer Report
includes teams, Programme Hours report includes Gender. IFRC template has
various tweaks to customise the VietNam RC experience & 2 prepop users to
test these.