Morwenna
I suppose it's a matter of having learned Tarot in your second language, and then wanting to relate to the cards in your first. Anything that works, in my opinion! I never verbalize to the cards, but I do verbalize when reading, even for myself (it sometimes helps to treat myself as a separate querent). Now I do have a second language--French--and sometimes I find a French word or phrase is best suited to what I'm thinking or feeling (though it's many years since I've spontaneously thought in French). Now I've never thought of Tarot in French before, but you've given me an idea: maybe, on those occasions where the meaning is clear as a bell but just will not come out in English, I should try French! And then recast it if I'm reading for someone who doesn't know French.