make dialog to choose the "viewable for" group of a post nicer

[Robert Jäschke]

... we need it in one line! For all pages ...

The suggestion is to use JavaScript for that: show only the current selection (public, private, or other) and when the user clicks/hovers it, show the complete dialog.

[Robert Jäschke]

Another small task that involves JavaScript.

Could look like this initially:

(x) public ( ) private ( ) other

When the user clicks on "other", it changes to

( ) public ( ) private (x) other ----------------

kde

l3s

...

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