This is a plugin to manage your translations anywhere in your website. Put the tags for every language you want to manage and the plugin will only display the text for the current language in the page.
Example of use :
It is based on the language tag like en-GB that you can find using the debug function of the plugin (see options of the plugin).
It is very useful if you are using multilingual content but have some third party extensions that are not compatible. This is no more a problem.