Localization

• addlocalizationdomain — add a new domain in localization mechanism.
• dgettext — get text translated into the current locale and a specific domain
• getdefaultlanguage — returns the default language used by Scilab
• getlanguage — returns current language used by Scilab.
• _ — Similar to gettext
• setdefaultlanguage — sets and saves the internal LANGUAGE value.
• setlanguage — sets the internal LANGUAGE value (for Windows only)