Support for localized Exec entries, please

[Ronny Standtke]

> XDG_DATA_HOME defaults to $HOME/.local.
Sorry, I missed this one. Anyway, this workaround creates again 
different problems. A workaround startup script has to be written for 
every locale dependent application and you can end up with deprecated 
desktop files in $HOME/.local (e.g. when you remove the application).

Can we, please, please, pretty please, start talking about improvements 
to the spec instead of wasting our precious time with inventing another 
broken workaround?

Best regards

Ronny