I don't know Latin but I think I can translate it.
"Yankee go home and stay there until we come and kill you." - Tom
Delenda est Islamia = Islam must be destroyed
In Hoc Signo Vinces = Through this sign (cross) you shall conquer.
In Partibus Infidelium = In the regions of the infidels (non christian).
In Omnia Paratus = Ready for all things