Converting note name language

[Akira]

I want to convert a English note name ly file into a German one.

I got a ly file of a piece from the Mutopia Project to transcribe into
woodwind quintet.
The ly file uses English note name(c-d-e-f-g-a-b) though I want to use
German one(c-d-e-f-g-a-h).

I tried to replace "b" for "h" and "bes" for "b" with a text editor,
but it didn't work.

How can I convert the note name language using convert-ly or something?