Remove changeEvent(QEvent::LanguageChange) implementation

This was implemented only for a small set of widgets. It's unlikely that
we will ever have or even want a dynamic language selection, until then
this code is only dead freight.

Change-Id: I1bff4e1e89057786c0e5cb57225a508c5d390d9c
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/git/stashdialog.h

@@ -51,8 +51,10 @@ class StashModel;
  * (in case restore fails due to conflicts) on current and
  * delete on selection/all. */
 
-class StashDialog : public QDialog {
+class StashDialog : public QDialog
+{
     Q_OBJECT
+
 public:
     explicit StashDialog(QWidget *parent = 0);
     ~StashDialog();
@@ -62,9 +64,6 @@ public:
 public slots:
     void refresh(const QString &repository, bool force);
 
-protected:
-    void changeEvent(QEvent *e);
-
 private slots:
     void deleteAll();
     void deleteSelection();