Cachemanger tab display incorrect

The Cachemanager tab ```Cache images``` display is messed up. Digging
around I noticed that the link for all subtabs in the admin interface
have the css ```id``` set to the tab name. In the case of the ```Cache
images``` tab, the tab name of ```images``` being used as the css
```id``` was picking up some css that was not meant for it. I dug around
some more, but could not find a reason for the css ```id``` being set on
the tab links. So, I removed it. All the other subtabs appear to still
be working correctly. However before implementing this pull request, you
may wish to do a more thorough review.
German translation at 98%
German translation 100%
adjustments of plugin priorities
Merge pull request #691 from JimBrown/1.4.6-Cachemanager

Cachemanger tab display incorrect
Help people realize that show_not_logged-in is active

fixes the normal login form so that
1. there is a message that the plugin is active
2. if you login you are redirected to the admin pages.
default priorities for register and remove filters really should be the same!
allow empty priority to remove existent filter

You really should not need to know the priority unless there is more
than one instance of the same function attached to a filter.
French Update
Don’t print footer nav in jquerymobile if there is nothing