Printed languages
Paper Magic: The Gathering card sets were originally printed in English only. The Legends expansion marked the first internationalized printing of a Magic set, in Italian. Further languages were added over the years until the current set of languages was reached: English, Chinese Simplified, Chinese Traditional, French, German, Italian, Japanese, Korean, Portuguese, Russian, and Spanish.
Note that the sets below are ordered by their English release date, but that the schedule for non-English releases was somewhat different. For example, the non-English versions of Revised were released after the Italian version of Legends was released. Today, all language printings are released at the same time. Still, all products aren't neccessarily released in every language.