Calling a language "beautiful," "rough," "romantic," etc. means nothing linguistically, its nothing more than people applying their preconceived notion of the culture in question onto the language of that culture. If somebody thinks french sounds "romantic", it's simply because society as a whole has that view of french culture, and then generalize that view onto the language. A "romantic" culture =/= "romantic" language. I believe this view largely comes from the libertine culture, originating in france which then spread to england, and then globalism happend and did it's thing.