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If you are making changes to the number of languages your site is available in, you can delete all languages except for the default one. This action also removes the translations for the deleted languages from your site and database.

If you additionally want to uninstall WPML, you can do a WPML reset. This removes all remaining WPML tables from the database.

To learn more, see the page about deleting languages and WPML plugin data by doing a WPML reset.