My native language is French, but I also speak fluent English and a little 日本語 and Spanish.

日本語はもっと難しいだったな。 El español era más fácil de aprender gracias a sus similitudes con el francés, pero, no hablo muy bien😅.

Oh btw, it is not “Que langue fait-vous parler” (blind traduction of the english “What language do-you speak”) but rather “Quelles langues parlez-vous?” (“What languages speaks-you?”).

We don’t use “do” for interrogative in french. The endings for “parler” (to speak) are: Je parle, tu parles, il parle, nous parlons, vous parlez, ils parlent. To make interogative phrases, just invert the pronoun and the verb: tu parles -> parles-tu? So “What language you speak” -> “What language speaks-you?”. Sorry for the awkward course ;)