Debugger: Fix language context actions

... again

Task-number: QTCREATORBUG-16099
Change-Id: Ie0a902a3161ca72cf78695639598eac5fdcbace5
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/debuggerplugin.cpp

@@ -2370,6 +2370,7 @@ void DebuggerPluginPrivate::connectEngine(DebuggerEngine *engine)
 
     engine->watchHandler()->resetWatchers();
     m_localsView->hideProgressIndicator();
+    updateActiveLanguages();
 }
 
 static void changeFontSize(QWidget *widget, qreal size)