It’s true that some scholarship is inaccessible to the rest of the world, even to scholars in other fields, simply by the nature of the questions it engages with. Sometimes your readers have to put in the work of reading and thinking deeply in your field before its more arcane debates make sense to them, just like you have to climb the steps to get to the top of a tower. But leaving your quotations untranslated is like greasing the steps behind you.