Localisation

• addlocalizationdomain — add a new domain in localization mechanism.
• dgettext — get text translated into the current locale and a specific domain (obsolete)
• getdefaultlanguage — returns the default language used by Scilab
• getlanguage — returns the current language used by Scilab.
• _ — Alias of gettext().
• setdefaultlanguage — sets the language of the session at startup and for some fixed Scilab menus
• setlanguage — choisit la langue utilisée pour les messages standard et les pages d'aide (session en cours)