The curve UI template can display several curves, typically Combined,
Red, Green, and Blue. Each is displayed by clicking a shortened button
C, R, G, B. The equivalent exists for Hue, Saturation, Value.
These single-lettered buttons can be translated using the already
extracted color letters.
R, G, B, H, S, and V all use the default translation context to refer
to the color already, so they do not need an extra context. C however
is already used for the letter in the context of vector
comparisons (as in A, B, C), so we add a Color context to disambiguate
it.
Pull Request: https://projects.blender.org/blender/blender/pulls/110491
00aca1cfb3