I saw someone else posted this but never told us how they worked it out. I would like to customise the text colour of the chat message for example...
["Muted"] = "{player} was muted by {initiator}: {reason}.",
would like to be something like for player name to show blue, word muted to show red and reason in red for example`.

Any help will be greatly appreciated. Thank you.

edit: I found an answer by looking at other plugins :) will post below for those that also ask this in future. Inside the oxide/lang/en folder look for the plugin file and edit that.
"Muted": "<color=red>{player} was muted by {initiator}: {reason}.</color>",

That format will only work for Rust; so for reference, the universal format would be like:

"Muted": "[#red]{player} was muted by {initiator}: {reason}.[/#]",

or

"Muted": "[#FF0000]{player} was muted by {initiator}: {reason}.[/#]",