Guidelines 01/2019 on Codes of Conduct and Monitoring Bodies under the GDPR
Section 5.10 Language
30. Code owners should comply with the language requirements of the CompSA to whom they will submit their code. In general, a code should be submitted in the language of the CompSA of that Member State. For transnational codes, the code should be submitted in the language of the CompSA and also in English.