Suggestion: Offer alternative note names (exp.: c' or c1 instead of middle c, german tradition) for Piano keyboard

1. Please offer an option to display alternative note names for the Piano keyboard, at least for educational purposes.

For example: in german music theory the middle-C is called c' or c¹ instead of C4. C3 is written as c, C2 as C and and so on. See uploaded graphic.

2. Please offer the option to hide all note notes from the Piano keyboard as well as show them all "c, c#, d ...".