Multilingual descriptions are placed between [lang=xx] and [/lang] tags, where xx is the language code (for example en, fr, es, ...).

[lang=en]Default description[/lang]
[lang=fr]Description en français[/lang]
[lang=de]Deutsche Beschreibung[/lang]

Special language default

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.

[lang=default]Default description[/lang]
[lang=fr]Description en français[/lang]

// OR

Default description
[lang=fr]Description en français[/lang]

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.

[lang=all]<p>[/lang]
  [lang=default]Default description[/lang]
  [lang=fr]Description en français[/lang]
  [lang=de]Deutsche Beschreibung[/lang]
[lang=all]</p>[/lang]