Hi,
If you are going to change something here, then please do it properly. A GmbH is a company, an association of persons. A terrain as it is mapped in OSM cannot be a GmbH. The GmbH is the operator, not the name. Telephone numbers in DE never have a zero after the +49. Zero is used in DE without the international dialling code +49, but never at the same time. 
Regards Protoxenus