reduce the number of places to update when new language is added

[Jiri Tomasek]

Currently there are 3 places to update when a new language is added to TripleO UI (https://review.openstack.org/#/c/431527/3/docs/translation.rst)

To reduce this, we could update languages in app config to match the format I18nDropdown uses:
"languages": [{"en": "English", {"ja": Japanese}, ...],

and make I18nDropdown populate the list from app config.

We have to maintain the sample app config anyway, so this does not pose any problem for end user.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/440788

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/442683

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/440788
Committed: https://git.openstack.org/cgit/openstack/tripleo-ui/commit/?id=e8eb44c5176869ac243d9488f61db1e48671bc5a
Submitter: Jenkins
Branch: master

commit e8eb44c5176869ac243d9488f61db1e48671bc5a
Author: Honza Pokorny <email address hidden>
Date: Thu Mar 2 15:59:13 2017 -0400

    Simplify addition of new languages

    Instead of having to update in three places, make it only two.

    Change-Id: I2d28d9019e8bcf9f6b8ef5698958932d44321679
    Partial-Bug: #1668978

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/442683
Committed: https://git.openstack.org/cgit/openstack/puppet-tripleo/commit/?id=60db285fd59eb36bca9d3a209c945e4f23412b3b
Submitter: Jenkins
Branch: master

commit 60db285fd59eb36bca9d3a209c945e4f23412b3b
Author: Honza Pokorny <email address hidden>
Date: Tue Mar 7 14:57:09 2017 -0400

    Refactor enabled languages from an array to a hash

    Change-Id: I5173361818508849e5012a943a984af69d9d08cd
    Depends-On: I2d28d9019e8bcf9f6b8ef5698958932d44321679
    Closes-Bug: #1668978

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/puppet-tripleo 7.0.0 release.