bug #4707 :  Adding of two error pages: one for HTTP 500 and another for HTTP 401 errors. The silverpeasinfo.jsp renders only the version of the running Silverpeas when it is accessed by an unauthenticated user
Merge branch 'bug-4707' of git://github.com/mmoqui/Silverpeas-Core into mmoqui-bug-4707
bug #4707 :  Add the forgotten messages for the 401 and 500 errors
Merge branch 'bug-4707' of git://github.com/mmoqui/Silverpeas-Core into mmoqui-bug-4707
Bug #4707 : modifying some messages.