message: [Trivial][UI] MN screen, inform and warn texts changed --> "Master node" for "Masternode".
diff: @@ -187,7 +187,7 @@ void MasterNodesWidget::onEditMNClicked(){
  if (index.sibling(index.row(), MNModel::WAS_COLLATERAL_ACCEPTED).data(Qt::DisplayRole).toBool()) {
  // Start MN
  QString strAlias = this->index.data(Qt::DisplayRole).toString();
  - if (ask(tr("Start Master Node"), tr("Are you sure you want to start masternode %1?\n").arg(strAlias))) {
  + if (ask(tr("Start Masternode"), tr("Are you sure you want to start masternode %1?\n").arg(strAlias))) {
  if (!verifyWalletUnlocked()) return;
  startAlias(strAlias);
  }
  @@ -255,7 +255,7 @@ void MasterNodesWidget::onDeleteMNClicked(){
  QString qAliasString = index.data(Qt::DisplayRole).toString();
  std::string aliasToRemove = qAliasString.toStdString();
  - if (!ask(tr("Delete Master Node"), tr("You are just about to delete Master Node:\n%1\n\nAre you sure?").arg(qAliasString)))
  + if (!ask(tr("Delete Masternode"), tr("You are just about to delete Masternode:\n%1\n\nAre you sure?").arg(qAliasString)))
  return;
  std::string strConfFile = "masternode.conf";
  @@ -346,7 +346,7 @@ void MasterNodesWidget::onDeleteMNClicked(){
  void MasterNodesWidget::onCreateMNClicked(){
  if(verifyWalletUnlocked()) {
  if(walletModel->getBalance() <= (COIN * 10000)){
  - inform(tr("No enough balance to create a master node, 10,000 PIV required."));
  + inform(tr("Not enough balance to create a masternode, 10,000 PIV required."));
  return;
  }
  showHideOp(true);
  