Installation
The Language Switch for Confluence can be installed through General configuration -> Section: Atlassian Marketplace -> Find new add-ons, so you can install the add-on via the Universal Plugin Manager (UPM).
See also: Managing Add-ons
Disable / Uninstall
The Language Switch for Confluence can be disabled/uninstalled through General configuration -> Section: Atlassian Marketplace -> Manage add-ons.
See also: Managing Add-ons