Make sort and filters for transactions and labels case-insensitive

src/qt/addressbookpage.cpp

@@ -113,6 +113,8 @@ void AddressBookPage::setModel(AddressTableModel *model)
     proxyModel = new QSortFilterProxyModel(this);
     proxyModel->setSourceModel(model);
     proxyModel->setDynamicSortFilter(true);
+    proxyModel->setSortCaseSensitivity(Qt::CaseInsensitive);
+    proxyModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
     switch(tab)
     {
     case ReceivingTab:

src/qt/transactionview.cpp

@@ -160,6 +160,8 @@ void TransactionView::setModel(WalletModel *model)
         transactionProxyModel = new TransactionFilterProxy(this);
         transactionProxyModel->setSourceModel(model->getTransactionTableModel());
         transactionProxyModel->setDynamicSortFilter(true);
+        transactionProxyModel->setSortCaseSensitivity(Qt::CaseInsensitive);
+        transactionProxyModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
 
         transactionProxyModel->setSortRole(Qt::EditRole);