diff --git a/collects/string-constants/private/german-string-constants.rkt b/collects/string-constants/private/german-string-constants.rkt
index 6ef78e7870..96688044cd 100644
--- a/collects/string-constants/private/german-string-constants.rkt
+++ b/collects/string-constants/private/german-string-constants.rkt
@@ -117,6 +117,11 @@
  (cs-unused-require "unbenutztes require")
  (cs-free-variable "freie Variable")
 
+ (cs-contract-my-obligation "Vertrag: Obliation dieses Moduls")
+ (cs-contract-their-obligation "Vertrag: Obligation des Klientenmoduls")
+ (cs-contract-both-obligation "Vertrag: Obligation sowohl dieses Moduls als auch des Klientenmoduls")
+ (cs-contract-unk-obligation "Vertrag: Oblikation unbekannt")
+
  ;; mode sub-menu in the "view" menu
  (cs-check-syntax-mode "Syntax-Check-Modus")
  (cs-mode-menu-show-my-obligations "Meine Vertragsobligationen")
@@ -1549,6 +1554,11 @@
  (ask-about-normalizing-strings "Bei Normalisierung nachfragen")
  
   (always-use-platform-specific-linefeed-convention "Immer die plattformspezifische Linefeed-Konvention verwenden")
+
+
+  ;; optimization coach
+  (hide-optimization-coach "Optimierungs-Coach ausblenden")
+  (show-optimization-coach "Optimierungs-Coach einblenden")
   
 
  )