updated translation resources
Use track metadata from Airtime in playout engine

* Resolves CC-5893: Metadata not updated on Airtime Pro
* Report track metadata in the schedule API, and make pypo pass that
  along to Liquidsoap via annotations.
* Move HTTP response sanitization for file metadata out of the REST module and into CcFiles
* Slightly improved the terrible exception handling in pypo
Merge branch '2.5.x' into cc-5709-airtime-analyzer

Conflicts:
	airtime_mvc/application/Bootstrap.php
	airtime_mvc/locale/de_AT/LC_MESSAGES/airtime.po
	airtime_mvc/locale/en_GB/LC_MESSAGES/airtime.po
	airtime_mvc/locale/pt_BR/LC_MESSAGES/airtime.po
Use track metadata from Airtime in playout engine

* Resolves CC-5893: Metadata not updated on Airtime Pro
* Report track metadata in the schedule API, and make pypo pass that
  along to Liquidsoap via annotations.
* Move HTTP response sanitization for file metadata out of the REST module and into CcFiles
* Slightly improved the terrible exception handling in pypo
Merge branch 'cc-5709-airtime-analyzer' into saas
Merge remote-tracking branch 'origin/cc-5709-airtime-analyzer-buy-now' into saas