Sorry, if you want to decrypt the Templars' code, you have to read German. But if you are able to do so and willing to have a look into medieval history, local and global, the crusaders' message will lead you to their treasure.
Jrvfhat -> A 50° 4_.___ / R 006° 0_.___
Avpug vzzre yvrtg qvr Ersreram rvarf Negrsnxgrf nhffreunyo qre Jryg qre Negrsnxgr.