Add field for faction to cards

[Beornwulf]

Most strategems and similar cards are often locked to a faction, and tend to include this in their text (a la "FACTION - Battle Tactic Stratagem"), and this doesn't currently fit neatly into the template but would be very useful.

[rweyrauch]

For the cards I've created, I've used the Card Header input for this.

Could you show me an example of what you would like?