> It's a pretty fantastic Rosetta stone of sorts with lots of documents translated professionally into multiple languages.

UN and EU documents have, unironically, been a significant resource in the development of translation software - they're a great source of parallel texts across broad sets of languages.

Given their subject matter, they're not great for colloquialisms - good luck finding a UN report that uses the phrase "fucking bullshit", for example - but they're a great starting point.