adjust DMdA languages so they do the same error rewriting that the HtDP

languages are doing. This seems to make the error messages in DMdA
behave like they did in 5.2.1 (and so I'm pushing this to see how DrDr
reacts)

collects/deinprogramm/deinprogramm-langs.rkt

@@ -25,6 +25,7 @@
 	 lang/debugger-language-interface
 	 lang/run-teaching-program
 	 lang/private/continuation-mark-key
+         lang/private/rewrite-error-message
 	 
 	 (only-in test-engine/scheme-gui make-formatter)
 	 test-engine/scheme-tests
@@ -1187,7 +1188,7 @@
       (define (teaching-languages-error-display-handler msg exn)
           
           (if (exn? exn)
-              (display (exn-message exn) (current-error-port))
+              (display (get-rewriten-error-message exn) (current-error-port))
               (eprintf "uncaught exception: ~e" exn))
           (eprintf "\n")