Fix for #1411 and #1407. Corrected the malreferenced variables, was not able to verify #1407 as being fixed since there wasn't clear instructions on how to replicate.

Adding initial en.i18n translations.

Adds 2 new permissions related to bulk user registration and bulk channel creation.  Permissions are assigned
admin role.

The nimble:restivus package, used by REST api, does not support alanning:roles with 'groups'.  It doesn't even
use the alanning:roles API to check for roles.  As a workaround, I removed restivus's rolesRequired check from
the bulk api methods and added Rocketchat.authz.hasPermission checks.