We're trying to avoid any database changes in the current 2.5.x branch so that it stays . In the future, I might nuke the cc_locale table so we don't have to touch the database to add new locales.

All of that aside, Airtime 2.5.x will continue to function if this upgrade script doesn't get run (on Airtime Pro). For that reason, I'm OK with letting these changes in. If you remove the version bump, I'll merge this into 2.5.x tomorrow. 
Thanks!