[I18n] Renew & add Zanata dev members as extra ATC

Zanata dev team has continuously helped I18n team and Infra team
to setup our translation system with open source software Zanata [1].
Also, they collect our requirements for Zanata and enhance Zanata.
Since they are not translators, they do not satisfy our standard
ATC requirements [2], but they helped a lot with kind opinions and
comments on translation platform such as Zanata upgrade [3].

More details:
 - Carlos is the manager in Zanata development team.
   He encouages Alex and Patrick to help I18n team with answering
   to OpenStack I18n opinions like [4].
 - Alex has helped a lot to collect Zanata feedback and Zanata upgrade
   with detail configuration suggestions [5].
 - Patrick also helped [5] and kindly answered Zanata upgrade details
   with opinions in openstack-i18n and openstack-infra IRC channel [6].

[1] https://translate.zanata.org/
[2] https://docs.openstack.org/developer/i18n/official_translator.html#atc-status-in-i18n-project
[3] https://blueprints.launchpad.net/openstack-i18n/+spec/ocata-zanata-upgrade
[4] http://lists.openstack.org/pipermail/openstack-i18n/2016-July/002300.html
[5] https://review.openstack.org/#/c/422373/
[6] http://eavesdrop.openstack.org/irclogs/%23openstack-infra/%23openstack-infra.2017-01-19.log.html#t2017-01-19T03:01:09

Change-Id: Ie8c0805e14e6952cce2132a6c5c9a0844a2edbab

reference/projects.yaml

@@ -1203,11 +1203,15 @@ I18n:
       comment: bokaitseng
     - name: Carlos Munoz
       email: camunoz@redhat.com
-      expires-in: April 2017
+      expires-in: April 2018
       comment: Zanata development
     - name: Alex Eng
       email: aeng@redhat.com
-      expires-in: April 2017
+      expires-in: April 2018
+      comment: Zanata development
+    - name: Patrick Huang
+      email: pahuang@redhat.com
+      expires-in: April 2018
       comment: Zanata development
 
 Infrastructure: