Fix missing of some translations

Task-number: QTCREATORBUG-13649
Change-Id: I69f78b3b8d2366003bfce81a2afba0068e716d22
Reviewed-by: hjk <hjk@theqtcompany.com>
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/debugger/watchhandler.cpp

@@ -199,6 +199,7 @@ public:
 
 class WatchModel : public WatchModelBase
 {
+    Q_DECLARE_TR_FUNCTIONS(Debugger::Internal::WatchModel)
 public:
     WatchModel(WatchHandler *handler, DebuggerEngine *engine);