I disagree. Back in the days when I planned on going into law (oh how things change
) , I studied German and Arabic at a top- 5 university. This included a year abroad, during which time I worked for a German law firm.
Throughout my degree I did mini-pupillages and two vacation schemes at excellent commercial city firms, all of whom complimeted me on my degree choice.
The law graduate (of which there are a LOT nowadays) knows the theory of law, but my German and Arabic degree set me apart from them because it was more practical. I'd not only proven that I could function long-term in a law firm (as shown by my year abroad), but I also spoke two languages, which were highly sought-after by international firms.
Yes, a law student may do a bit of language in their spare time, but I'd bet they wouldn't be at the standard that they could go to a large foreign law firm and start work as a paralegal.
So, yeah, there's no way I'd advocate doing a law degree if your heart lies in another subject. Provided that subject is respectable, study it and convert. Just my two cents.