Ok, this is from the Appendix...

Appendix D - Flavor Text

There are several tags you can use to fill quest text with the names specific to the game in progress.

[SovereignName] - The name of the player.

[CapitalName] - The name of the player's Capital City.

[MinorFlavor1] - Flavor text specific to the Minor Race you're talking to (if this is a Minor Race Interaction).

[MinorFlavor2] - Flavor text specific to the Minor Race you're talking to (if this is a Minor Race Interaction).

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Other ones which can be used are:
[FactionName] - ???
[WorldName] - ???
[LeaderName] - ???
[FactionLongName] - ???
[CityName] - ???
[ImprovementName] - ???
[LeaderHisHer] - ???
[ShortFactionName] - ???
[UnitName] - ???
[KilledFactionName] - ???
[KilledSovereignName] - ???