[The following article is from the Wikipedia @ 20 blog and extremely interesting to have here as well. The present copy is a draft version and offered on the original page together with the invitation to propose improvements. Denny Vrandečić (actually Zdenko) is working at Google. Previously he has been at the Institute AIFB at the KIT (Karlsruhe Institue of Technology) and at Wikimedia Deutschland, where he founded Wikidata.]
Wikipedia is available in almost 300 languages, each with independently developed content and perspectives. Sharing more knowledge across languages would allow each edition to focus on their unique contributions, and yet improve their comprehensiveness and currency.
Differences between Wikipedia language editions
Wikipedia is often described as a wonder of the modern age. There are more than 50 million articles in almost 300 languages.