Warn before loosing characters, when the encoding is set badly.
Warn before loosing characters, when the encoding is set badly.

svn path=/trunk/kdenetwork/kmail/; revision=73129

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