Add tooltips according to usability recommendation.
Add tooltips according to usability recommendation.

svn path=/trunk/kdepim/; revision=325370

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi