enter works now when modal is up.

src/message/simple_messages.py

@@ -1,4 +1,4 @@
-from browser import window
+from browser import window, document
 from message.message import Message, msg
 
 
@@ -37,7 +37,14 @@ class KeyboardPress(Message):
         return key == "Escape"
     
     def update_model(self, model):
-        pass
+        key = self.get_arg(0, str)
+        
+        # Enter when modal shown -> press ok button
+        if model.modal_shown and key == "Enter":
+            ok_button = document.getElementById("modal-ok")
+            if ok_button is not None:
+                # has to be called in separate thread
+                window.setTimeout(lambda: ok_button.click(), 10)
 
 
 # a "hack" message for reseting modals #