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Wikipedia pages have the article in different languages on the left pane. How does this linking work?

I have also noticed that the language options change when you go to one that is listed there. Are the pages listed in the page's plain text?

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You used to have to add language links in the article text, but that has not been true for the last few years.

Interlanguage links are managed from the Wikidata specialty site.

Find the specific topic you want to add an interlanguage link to on Wikidata (e.g., Beer) and add the correct link in the proper format.

Much more information is available from Wikipedia Help.

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