Fix zanata_users.py to support Zanata 3.9.6
Fix zanata_users.py to support Zanata 3.9.6

HTML of individual language page was changed in Zanata 3.9.6.
This commit catches up with the change.

Closes-Bug: #1670725
Change-Id: I77df5c1f4b716b395f0f686b6a9e2e48649bedcf

openstack/i18n,openstack/i18n