Test email: Success-message should be distinguishable

[julianhofmann]

When testing a newsletter (especially while setting up the template), you'll send the test mail several times to the same receiver. When resubmitting the form you get no visible feedback if something happened - the screen looks like before (except for the quick flash when reloading).

Adding the receiver and the time to the success-message would be helpful

[einpraegsam]

Good idea, PR are welcome :)

[einpraegsam]

Thx, I just pushed a new feature for this issue. We now simply add the number of already sent testmails (1 for the first mail, 2 for the second, and so on)