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On wiktionary NL, a template is used for translations. In this template there is
a link to a translation in the same wiktionary (NL) as well a a link to a word
in another wiktionary in superscript. However, there no wiktionary for all
languages. Most wiktionary's that exist are identified by their ISO 639-1
language code (2 letters), other languages are identified by their ISO 639-3
language code (3 letters).

The StringFunctions extension would be usefull to check whether an ISO code is
valid to link to an other wiktionary (by using {{#len}}).

Annabel

See also: http://meta.wikimedia.org/wiki/StringFunctions#.23len