Fix live search filter
Fix #1266 when removing a field, the right panel is not updated
Fix #1267 List is not renumbered after delete & Fix #1264 Can not add field, if there is no field in database
Add placeholder for source input
Fix tests
Merge pull request #482 from nlegoff/fix_admin_fields

[3.8] Fix admin fields application
Fix #1243 Phraseanet enabled languages is now configurable
Ensure configuration is set up before trying to look for special conf