@Mateusz 
1) "What you are changing and why?" - Keys storing "diarienr" and "nvrid" where converted from "lst:diarienr" and "lst:ref" to the discussed and approved standard keys "ref:SE:diarienr" and "ref:SE:nvrid" to have the values stored at expected places and to be able to use tag2link for the NVRID .

2) "Why you think that such mass prefixing is a correct edit?" - What is "mass prefixing" and what is "a correct edit"?