Add triggers for bozjan southern front CEs

[quisquous]

This came up in discord and has come up a few times as a point of confusion. The bozjan southern front has triggers for castrum, but nothing else. Zadnor has triggers for everything because I did them while I was levelling.

If somebody feels up to writing these because they're levelling in bozja, please submit PRs. Mostly just having triggers would be good. There's no timelines for Zadnor CEs so we probably don't need them here unless somebody is feeling extra ambitious.