Break long words via CSS in some places

[ocean90]

For example the tab box or menu item title.
It would fix the layout in IE 6, see ​http://grab.by/4Bqe or ​http://grab.by/4Bqg.
Firefox screens:
Before: ​http://grab.by/4Bqn | After: ​http://grab.by/4Bqp

Menu item title:
Before: ​http://grab.by/4Brj | After: ​http://grab.by/4Brs

[ocean90]

Works in Opera, Safari, Firefox, Chrome, IE 6/7/8/9

[nacin]

(In [14990]) Use word-wrap:break-word in the nav menus. props ocean90, fixes #13574.