Here "nations" and "languages" represent people from different nations who speak different languages. See how you translated this in [Daniel 3:4](../03/04.md). Alternate translation: "people from different nations and who spoke different languages" (See: [[rc://en/ta/man/translate/figs-metonymy]])
King Darius wrote his message to his entire kingdom which was huge. Here it says "all the earth" as a generalization to emphasis how large his kingdom was, though it did not include everyone on the earth. Alternate translation: "in his kingdom" (See: [[rc://en/ta/man/translate/figs-hyperbole]])