CS-5415 Add Armenian and Azerbaijani support to Newscoop 4.3 install and upgrade SQL

This pull request is required for the South Caucasus projects. The database upgrades use the now-favoured INSERT IGNORE syntax for adding new rows to the Languages table, as used in the 4.2.x branch:

https://github.com/sourcefabric/Newscoop/commit/ae833a59c29b9b541c5fd81d5fa2884c631fa4b6

It also introduces a fix for CS-4603 and some general localization updates from the 4.2.x branch.

The sample database will be updated in a later pull request, pending a fix for CS-5403.