Multilingual descriptions are placed between [lang=xx] and [/lang] tags, where xx is the language code (for example en, es, fr). There are also 2 special languages : [lang=default] and [lang=all]
[lang=default] default description [/lang]
[lang=en] description in english [/lang]
[lang=de] deutsche Beschreibung [/lang]
The default description will be used if the description is not available in the connected user selected language. If [lang=default] does not exists, anything outside the [lang] tags will be considered as the default description.
Special language all: anything inside [lang=all] will be included in the description, whatever the connected user defined language is. This is mainly useful to include HTML/JavaScript code inside a description.