Hi Teodor, may i come in ?
It's nice when things come to make sense.
It was expectable that, sooner or later, questions would be raised on this piece being Berber or Moroccan, as Jim expertly did.
As you well suspected, it would be implausible that the inscription was made over there, as alusive to the missionaries, and rather logic that it is Latin American work, as directed to the Dominican People in their strugle for independence.
Actually Dominicans and Franciscans have been in the Magreb, in their attempt to convert the locals ( first incursion was in the XIII century ) but never had time to warm up their seats

. It is known that some ended up executed by the sword, but i don't see the locals humor so sharp as to inscribe such phrase in their swords, even considering these missionaries were really valiant ... or crazy

.