Actually, from what I’ve read (in articles such as this one), Germany offers free university education even to Americans. You do have to pay for housing, student fees and a health insurance fee, but the cost each year can be only $6-7,000. (And while many courses are taught in English, some proficiency in German is needed for day-to-day life.)
If you’re willing to put in a few years of practice after foreign licensure (three in the case of Colorado), you can also be licensed as a foreign legal consultant, advising on that country’s laws.
I went to law school and am licensed in a non-U.S. country, but there’s no LL.M. track to bar admission in my state, and I don’t have the years of practice to be licensed as a foreign legal consultant either. So while I can’t practice foreign law per se, I was pretty luck to get a non-lawyer job at a Big Law Firm where I assist attorneys who are licensed in the same jurisdiction, doing quasi-law work and making around 20% below what first-year associates make. I paid around 14,000 over the course of three years, much less than what the firm’s associates probably paid.
Note also that for many non-law jobs, having gone to law school is regarded as a negative asset, and some jobs even state that they don’t want JDs.
Check out reasons not to go to law school here.
I can confirm what Dewey Finn says—non-EU citizens aren’t treated any differently than EU ones when it comes to tuition fees here. Yes, you still need to pay for your own health insurance, accommodation, food, and other living expenses, but you have to do that in America too.
The situation is even better for doctoral students, who don’t even need to pay enrolment fees if they don’t want to. (The only formal requirement for a Ph.D. at most German universities is to write and defend a dissertation. You don’t need to formally register as a student and you don’t need to attend classes or write exams. In theory, you could just walk into a random university, thesis in hand, and ask to defend it there. In practice, most doctoral candidates, at least in the sciences, are employed as full-time research staff by the university at an annual salary of €44K to €64K.)
It really depends on the program as to how much of it is offered in English. Some undergraduate programs are entirely in English, some are entirely in German, and some are a mix of the two. (I’m guessing that law will be mostly in German, though maybe there are some degree programs focusing on international law that are taught primarily or exclusively in English or maybe French.) As I mentioned above, classes aren’t generally required for higher degrees like doctorates, so German knowledge isn’t an issue for those.
As to whether German proficiency is required for day-to-day life, I’m sure it’s not. At least a couple of my colleagues have been doctoral candidates who spoke no German. Somehow they managed to get by.
Here are Colorado’s rules (in part) for becoming an attorney licensed to practice when obtaining a degree in a foreign country. Note especially the part about having to have gotten your degree in a country that is primarily English-speaking, and which relies upon English common law. 
I’ve been a lawyer since 1992, and have been mentoring young lawyers for quite awhile through a program run by the Supreme Court of Ohio. Several of my mentees have been either unemployed or underemployed for years after graduating. There just aren’t the jobs out there for the thousands of bright-eyed young lawyers who graduate and start looking for work twice a year. I have told several young people that unless you are passionately drawn to the law and/or are pretty sure of having a job waiting for you when you graduate, you really should look into another career.
I posted in a thread about this a while back, I am in my 1st year at WUSTL, which is a theoretically decent school* that also is very liberal with scholarships - over half of the class gets some kind of assistance. My scholarship covers most of my tuition, I pay about $6k/semester. Work on getting a high LSAT score, which unlike most other advantages in life (rich parents, good looking, etc) is a thing that you can achieve if you put in some elbow grease. I think you should be able to do it as well, especially if you are black or Latino.
By any objective measure it’s still a terrible idea and I am almost certain that this was a huge mistake and waste of time, but at least it’s not costing me that much out of pocket, so I’ve got that going for me I guess.
*To clarify, the faculty is wonderful, it has a beautiful campus and vibrant community and generally an enjoyable place to be. It keeps my mind off my imminent unemployment and destitution for a while.
TL;DR: You can do it on the cheap, lots of people do. Don’t actually do it though.
Do you actually want to be an attorney? Or just do something with law? Since you already have a degree, you can get a paralegal certificate in short order. That would let you spend a small amount of money and time to get your “feet wet” in law. I hear the pay can be pretty decent, it’s easier to find work overall, and if you are awesome at being a paralegal, perhaps the firm you work for might chip in for law school. Just food for thought.
Reported.