[Bug 4345] Localization: Language-Negotiation, Language selection

http://www.w3.org/Bugs/Public/show_bug.cgi?id=4345

           Summary: Localization: Language-Negotiation, Language selection
           Product: Validator
           Version: HEAD
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: check
        AssignedTo: ot@w3.org
        ReportedBy: ot@w3.org
         QAContact: www-validator-cvs@w3.org
OtherBugsDependingO 4343
             nThis:


Add Language Negotiation routine, with an override if a language parameter is
given. 

Set the templates path according to the language chosen, and available
languages.