STR_ALIEN_DIPLOMACY_UFOPEDIA:
disappeared ancestors -> lost ancestors
Not a bad idea. But it's a mission, so it should have a mission-like name.
I meant more grammar-wise. looking for their disappeared ancestors -> looking for their lost ancestors. it sounds odd (to me, at least) to have "disappeared" take an object.
btw, I can't wait to try out the new mission (and the changes to cydonia). It looks awesome : )
Edit: another couple capitalization mismatches:
line 29030: Resources/FinalModPack/Alt_aliens/Floater_Medic/FloaterMedic.png
the filename is floaterMedic.png
line 29037: Resources/FinalModPack/Alt_aliens/Floater_Navigator/FloaterNavigator.png
the filename is floaterNavigator.png