<translate> The Translate extension, due to its nature of rapid development, requires a relatively recent version of MediaWiki to work. The aim is to support the development version and the two latest stable versions of MediaWiki. In package managers, the version may be too old to fulfill the requirements. In that case you need to download a newer release from mediawiki.org or from Wikimedia's Git repository.
The Translate extension uses a continuous development model, which means that latest version should never be totally broken, because all commits to Translate extension are peer reviewed and pass unit tests. The core functionality is pretty stable, but there may be bigger changes from time to time.