AF improvements

- Some small details addressed
- An AF localisation overhaul for first-person perspective, where appropriate, like other CKII events + much more variation in the various event texts and options + mild flavor + some clarifications
- A set of ongoing war checks which affects the trigger (only 1 case, for robustness) and MTTH (a couple cases of varying degree for which the faction is willing to delay-- for awhile longer, at least-- due to a large-scale offensive war or the liege pushing someone else's claim) of the faction meeting start event
- It is now possible to force a faction meeting to be called by event, regardless of when it was last called (but the other trigger conditions still apply)
- If you step on a crack, you'll fall and break your back
- PB's revolt CBs are now properly tagged as revolts/major_revolts so that the AI and various event triggers may act accordingly.  It's possible that this may have consequences which I have not foreseen, but I don't think so.
- Did enough testing to confirm no breakage and that the new localisation looks great, as did all the associated functionality (missed the happy cases, but I'm sure they're fine too)