Translates a SoHL speaker roll-mode value into the Foundry v14 message-mode
key for ChatMessage.applyMode (see MESSAGE_MODE_BY_ROLL_MODE).
A value that is not a known SoHL roll mode — an already-translated
message-mode key or a custom mode — is returned unchanged.
Parameters
rollMode: string
A SoHL speaker roll-mode value (e.g. "publicroll").
Returns string|undefined
The equivalent v14 message-mode key, undefined for the default
(system) mode, or the input unchanged if it is not a known roll mode.
Translates a SoHL speaker roll-mode value into the Foundry v14 message-mode key for
ChatMessage.applyMode(see MESSAGE_MODE_BY_ROLL_MODE). A value that is not a known SoHL roll mode — an already-translated message-mode key or a custom mode — is returned unchanged.