Editor highlighting doesn't work after upgrading to 6.8

Created by: BaBL86

When I try to edit code from browser, I have no highlighting. There is an error in browser console:

GET http://gitdev.ascottgroup.eu/assets/ace/mode-php.js 404 (Not Found) application-c829d5570fd54ca20cb3a55ba2620093.js:21

please, fix this.