Feature request : Color sub-graph texts

[robertrub]

It would be helpful to have the "names" of the curves using the same color as the graphs.

IOB in blue, COB in orange etc

[vanelsberg]

Would be a good UI improvement.

[ga-zelle]

When I started creating more graphs specfic to AutoISF I had the same idea. For starters I use the same colour for curve and menu label background.

Colouring DEV will be interesting because with that guideline we need every letter to be in one of the possible colors (where are the emojis to be shown here?)