Flag cust & oust name/description fields as translatable

Setting type names and descriptions should be translatable, a simple
oils_persist:i18n attribute will do the trick.

Signed-off-by: Dan Scott <dan@coffeecode.net>
Signed-off-by: Remington Steed <rjs7@calvin.edu>
Signed-off-by: Ben Shum <bshum@biblio.org>
Finish i18n support for config.usr_setting_type

Add the missing oils_i18n_gettext markers to config.usr_setting_type
inserts.

Signed-off-by: Pasi Kallinen <pasi.kallinen@pttk.fi>
Signed-off-by: Remington Steed <rjs7@calvin.edu>
Signed-off-by: Ben Shum <bshum@biblio.org>