[Private] signs for blocks doesn't display

[YacuGitHub]

Hello!, Is there any way to make [Private] signs for blocks display another color when protecting?,
I think it is not as interactive compared to the other signs like the one you get when creating an RP, or in case of my server, the shop ones, so it sometimes seams that it isn't set up correctly,

Or could it be with the fact that i'm translating it?, for example:

"&a[RP]: Listo."
Works for the color code, but;

"&a[Privado]"
Doesn't apply the color code or the protection, even if i literally write "&a[Privado]" with the color code in the sign, which isn't ideal, but just noting that it doesn't protect and/or apply the color to the Private sign

If this is my error, for example translating the signs not how it is intended to be made, I'm sorry, please explain to me how i should make it,
If you guys help me make this i'd be really thankfull!, Thanks for reading.