BUG: File Uploading Notifications (fixes #7883)
BUG: File Uploading Notifications (fixes #7883)

* Moved allowed file types into a variable to be used in the template.

silverstripe/silverstripe-cms,jonom/silverstripe-cms,helpfulrobot/i-lateral-silverstripe-siteconfig,silverstripe/silverstripe-siteconfig,dhensby/silverstripe-cms,dhensby/silverstripe-reports,jonom/silverstripe-cms,silverstripe/silverstripe-cms,silverstripe-labs/silverstripe-reports,dhensby/silverstripe-cms,dhensby/silverstripe-cms,silverstripe-labs/silverstripe-reports,dhensby/silverstripe-reports