German Sign Language (DGS - Deutsche Gebärdensprache) is the language of the Deaf community in Germany and in the German-speaking part of Belgium. German Sign Language was first legally recognised in The Federal Disability Equality Act (2002) in May 2002. Ref
Video above: The German national anthem in German Sign Language.
German Sign Language Dictionary. https://www.sign-lang.uni-hamburg.de/dgs-korpus/index.php/welcome.html
German Federation of the Deaf. https://www.eud.eu/eud-members/full-members/germany/