Addition of French (latin) chord and note names
I live in France and here they don't use/teach A,B,C,D,E,F,G as the note names, but Do, Ré, Mi, Fa, Sol, La, Si. So a DoM or DoMaj chord is a CM or CMaj chord, etc.
I believe France shares this with some other languages/countries as well (Spain, Italy, etc.).
While there is certainly an awareness of the Anglo-Saxon chord system, the Do, Ré, Mi system is WIDELY used as well and I don't think it's going away.
It looks as if harmony.cpp has the A-G hardcoded note names and I don't know that, given the amount of things that depend on it the reference to a "C" or "C E G" form, etc. that this sort of base reference is what needs to be translated. Rather another "filter" if you will, needs to be in place to allow the text that one sees on the score to reflect this sort of language/country-specific chord naming convention. Obviously, this would need to work with transposition actions as well (as the anglo-saxon chord names do now).
As a short-term work around, I suppose that this could be a plugin that allows one to change the chord names for printing and then to change them back for transposition activities. I have not seen a plugin like this if it already exists.