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