i18n Management Commands for Central Server

Changes:

1. updates to the UI to start the process of making language packs available
2. Two new management commands for i18n
    - One which *will eventually* cache translations from CrowdIn
    - the other updates po files and generates test files

@bcipolli don't hesitate to throw some "wats" :+1: thanks for your help

**edit also a bunch of new wrapped strings