In addition to /u/Kochevnik81 's reply (mentioned in Sunday Digest | Interesting & Overlooked Posts | May 07, 2018–May 13, 2018) pointed to by /u/silverappleyard , there was also 'In the Communist Manifesto, Marx explicitly states that the Manifesto will be published in "French, English, Flemish and Danish". Why Danish? We're there strong Communist sympathies in Denmark?' by /u/yodatsracist .

This is not to discourage discussion. More questions, data, and debate are welcome.

Not to discourage further answers, but you may be interested in this previous one on the subject from u/Kochevnik81.