Fix: view method call introduced with translation

[FIX 57211498]
Fix show ZencoderJobs for audio files in new admin interface
Zencoder: use ENV['URL_HOST_PART'] in place of ENCODING_BASE_URL
Set stable version to 1.7.9
Removed several data migrations so migrations run again completely

also deleted unused personas dump
Constrain some permissions fields to be constantly false
Permissions overhaul: removed revoke behavior of userperm.
Reverting to firefox for apply_to_all.feature
Fix entrusted_resources: with out public permissions
Switching to firefox for admin_previews.feature
Refactoring dropping aggregated permission in dialog
Destroying meaningless group/userpermission within update action
Domina meta, testing completeness of tests
Domina: changed substitions to only appear in values, never keys
Feature test batch edit: enable feature test on ci
Fix: apply scrolldown only to dropdown not to dropup
Added @poltergeist_debug to the capybara drivers
Added sql queries to worksheet for counting empty permissions
Implemented batch_edit feature tests
Show presets with manage permission (like Bevollmächtigter) as option for Userpermission