The translateMessage argument is not used for simulation chat (aichat) messages, chat is always translated, only guiinterface "timenotifications" have a translateMessage property.

Concern:
The "name" should not be translated, because it has already been translated in the gamesetup as of rP14954 (chosenName = translate(chosenName);). So this actually results in translation errors (as there is no translation of a translation unless the translation is the same as the english string).

rP16533 changed it to colorize the playenrame which totally breaky the translation:

tinygettext: Couldn't translate: [color="50 170 170"]Lysander[/color]
tinygettext: Couldn't translate: [color="220 115 16"]Hampsicora[/color]
tinygettext: Couldn't translate: [color="64 64 64"]Kambyses II.[/color]

In rP17382 it was changed to not translate in multiplayer, then this line would translate without runtime errors but against the design to not translate in multiplayer.