Best practices
Keep the same language order
Across pages. Your authors edit and review several; a stable order saves them hunting.
Put your most common language first
It is the fallback when a reader's language is unavailable.
Keep pages to a few languages
There is no technical limit, but display time grows with each language on a page, noticeably so beyond a handful. The app marks pages past three languages - not an error, just a signal. Up to three or four keeps the experience fluid; beyond that, ask whether every language truly belongs on this page. Very long, many-language pages are also harder to edit.
Translate the text, not the structure
Identical headings, lists and tables across languages make discrepancies obvious at a glance when updating.
Warn before removing a language
Deleting a macro moves the affected readers to the default language, with no notice on their side.
Changes notify everyone
A change in one language notifies everyone watching the page, and shows in its history. That is normal Confluence behaviour, and it surprises people at first.
The page title
A page's title exists in one language only, shared by every translation - see feature details. Two approaches work well: write it in the team's main language, or give it a short form everyone recognises - a product code, a proper noun, a reference.