Make executables to waiting for po as input
Add some function to po files
Rewrite makefiles to use po files for merge
Change KeyId generator not to use xml special
charachters
One filetype remain: properties

Change-Id: If2bd2ae7afc61518c2d838a3cae301ef62dd9761
Reviewed-on: https://gerrit.libreoffice.org/593Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>