prevent to fire delete ajax a second time.

Before the click on a single file delete icon fired two different handlers - one of them is for multiple deletion only
Merge pull request #2578 from owncloud/fixing-2577-master

prevent to fire delete ajax a second time.
[tx-robot] updated from transifex
Use displayName in the From field of outbound email about new shares.

This is important in the Active Directory case where users are
currently getting a GUID in the From field, making emails look quite a
lot like spam.
Users: use DisplayName in the Display Name col when appending users
Merge pull request #2598 from ceri/master

Use displayName in the From field of outbound email about new shares.
Files External: show display names instead of internal user names in Settings UI