Add warning_gettext() wrapper function that changes to the user locale,

then calls gettext().
Add U_ macro that calls warning_gettext() instead of gettext().
Rename warning2()/error2() back to warning_nodebug()/error_nodebug().

plugins/sudoers/timestamp.c

@@ -410,7 +410,7 @@ remove_timestamp(bool remove)
 	if (!remove) {
 	    timevalclear(&tv);
 	    if (touch(-1, path, &tv) == -1 && errno != ENOENT)
-		fatal(_("unable to reset %s to the Unix epoch"), path);
+		fatal(U_("unable to reset %s to the Unix epoch"), path);
 	}
     }