Show administrative title of a pane on hover

Problem/Motivation

Currently if you've narrow regions the administrative titles of panes are partially hidden.
This can be annoying if you don't have the exact order of the panes in your mind or if you use visibility rules and need to modify a specific pane.
You've to use an HTML inspector or to open the settings to see the full title of the pane to ensure you're acting on the right one.

Proposed resolution

I suggest to add a the title attribute to the span wrapping the administrative title. That way you've at least a chance to see the full title on hover (should have broad browser support: http://www.w3schools.com/tags/att_global_title.asp).
And this works without any additional JS that might interfere with the drag & drop functionality.

Remaining tasks

reviews needed

User interface changes

Nothing to obvious ;) When hovering over the administrative title of a pane the full title should show up as tooltip.

API changes

none