First steps for i18n support
First steps for i18n support

* babel.cfg added;
* translations initialized for all endpoints;
* i18n tools cfgs added.

Partially implements blueprint savanna-i18n

Change-Id: I431d703c6193cc4af9324492209bda27075a78a8

openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests,esikachev/sahara-tests,esikachev/sahara-tests,openstack/sahara-scenario,esikachev/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests