1. Method for internationalizing the content of markup documents ( 8 ), which consists of: detecting a tag dedicated to the localization of the document ( 8 ), one or more localization attributes, and possibly a default localization value associated with said tag by means of a localization tool ( 11 ); searching, if necessary, in storage means ( 9 ) in a translation file ( 10 ) for the localized value of the element associated with this or these localization attribute(s); replacing the tag in the document ( 8 ) with the localized value found in the translation file ( 10 ), or with the default localization value, or with a value obtained via automatic transcription functions.