Move top bottom

Hi again.

Here's my first real feature pull request, eventhough it's a rather modest one.

I spend a lot of time moving the episodes from the bottom to the top of the queue, one line after the other. So here's a proposed commit with "Move to top" and "Move to bottom" entries in the queue item menu.

I translated these entries only in German (feel free to check, as I haven't spoken German for quite a while), English and French.

Best regards

Patrice LACOUTURE