It's very hipster, Das Kapital. (with the dot/period, check the cover https://en.wikipedia.org/wiki/Das_Kapital#/media/File:Zentra... )

But in English it would be just "Capital", right? (The uncountable nouns are rarely used with articles, it's "happiness" not "the happiness". See also https://old.reddit.com/r/writing/comments/12hf5wd/comment/jf... )