More explicitly documents ATCs & AUCs
More explicitly documents ATCs & AUCs

ATCs are recognized to translators who contributed to
OpenStack official projects. User Committee recognizes translators
who contributed to user and operator code and documentation
translation [1].

[1] http://eavesdrop.openstack.org/meetings/uc/2018/uc.2018-10-01-18.02.log.html

Change-Id: Iaf1780a6ae4d3e1100f8624e1c45c348166aa499

openstack/i18n,openstack/i18n