Update status messages when documents are sent by e-mail

![bildschirmfoto 2014-07-31 um 08 58 33](https://cloud.githubusercontent.com/assets/485600/3760884/7192b9fa-1880-11e4-9cfe-686aca59c0d2.png)

 - First message says "Versandtes E-Mail", second message "Mails". Either singular or plural
 - Use "E-Mails" instead of "Mails"
 - Could the referenced e-mail content be linked in the status message? Would be very helpful.