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No, that's not it! Pandora's has Spanish (or something similar, an unknown language), and the stone was brought from afar. Since the craftsmanship and symbols on it are strange, maybe it was brought from Spain, and the language there is Spanish.
And Taco's has a clan name written in Latin (or something similar), which could also be an unknown language. Plus, the drawing suits both.
Of course, I'm not saying this is 100% certain, and I don't rule out that these inscriptions might just indicate that this stone is a rune for summoning a demon, and there are always some incomprehensible inscriptions on them.
That's why, in general, I suggest judging based on the first murder, because it's harder to figure out the second one. IMHO.