To the author of the new LSR snippet 1187 "New pitch language" https://lsr.di.unimi.it/LSR/Item?u=1&id=1187
You add your new language to "nederlands", thus \language "alpha" returns a warning: warning: Could not find language `alpha'. Ignoring. Please fix or delete that line. Furthermore, I think we should not advice how to change an internal Frescobaldi-file in such a snippet. But that's only me. Others? Cheers, Harm