Add a mailing list for internationalisation team

The Internationalisation and Translation team has
decided to make the move from launchpad.

As such, they need this new mailing list!

As per OpenStack community defacto policy, the name
has already been debated to the Nth degree, but your
comments are also welcome! :)

Change-Id: I4152c50532174357be6c77e6bffe23b4b156769e
Reviewed-on: https://review.openstack.org/34853
Reviewed-by: daisy-ycguo <guoyingc@cn.ibm.com>
Reviewed-by: Stefano Maffulli <stefano@openstack.org>
Reviewed-by: Elizabeth Krumbach Joseph <lyz@princessleia.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Tom Fifield <tom@openstack.org>
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins