Show a localized message if the program was killed.

* This will most likely happen by the OOM killer, thus we inform the user about the memory restriction.

app/assets/javascripts/editor/execution.js

@@ -47,6 +47,7 @@ CodeOceanEditorWebsocket = {
     this.websocket.on('render', this.renderWebsocketOutput.bind(this));
     this.websocket.on('exit', this.handleExitCommand.bind(this));
     this.websocket.on('timeout', this.showTimeoutMessage.bind(this));
+    this.websocket.on('out_of_memory', this.showOutOfMemoryMessage.bind(this));
     this.websocket.on('status', this.showStatus.bind(this));
     this.websocket.on('hint', this.showHint.bind(this));
   },