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/branchdialog.cpp

@@ -312,18 +312,6 @@ void BranchDialog::rebase()
         stashGuard.preventPop();
 }
 
-void BranchDialog::changeEvent(QEvent *e)
-{
-    QDialog::changeEvent(e);
-    switch (e->type()) {
-    case QEvent::LanguageChange:
-        m_ui->retranslateUi(this);
-        break;
-    default:
-        break;
-    }
-}
-
 QModelIndex BranchDialog::selectedIndex()
 {
     QModelIndexList selected = m_ui->branchView->selectionModel()->selectedIndexes();