#333456 by mooffie: Corrected sample code in panels_panels_include_directory() docblock to use plural plugin type names.

Updated general panels_page settings form validation to prevent errors resulting from names consisting only of numbers.

#247695 by sdboyer, chaps2: Fix to ensure that display/pane exports have all relevant configuration data. Also added an informational-only update function encouraging site admins to re-export any previously exported Panels, as the exports were potentially affected by this problem.

* Updated German translation (60% complete)
* Requires patch in #293461

Tweaked pane rendering to skip creating a title if no title was returned by the pane render callback. (Backported from 6)

The reasons for its removal are...unclear. I'm commenting it out for now, but am continuing to investigate the changes around that time, as I can't remember my line of thinking for removing it.

Another E_NOTICE compliance fix in _panels_page_get_title() that I missed when I fixed the other three.

Heh. The callback functions these menu items were seeking don't even exist. Talk about old, crufty, unused code...that somehow all of us have missed and left in!

* Build on top of uncommitted patch #293461.

The PHP5 version of the css filter was inadvertently committed; this change reverts to the PHP4-compatible version.

In particular, this commit actually renders the new custom_php.inc content type plugin useful...up until this commit, it only had 'Unknown contexts' being loaded into it.