qt send tab: try to make it clearer the sender pays the fee

related: https://github.com/spesmilo/electrum/issues/7488

electrum/gui/qt/confirm_tx_dialog.py

@@ -136,9 +136,12 @@ class ConfirmTxDialog(TxEditor, WindowModalDialog):
         self.setLayout(vbox)
         grid = QGridLayout()
         vbox.addLayout(grid)
+
+        msg = (_('The amount to be received by the recipient.') + ' '
+               + _('Fees are paid by the sender.'))
         self.amount_label = QLabel('')
         self.amount_label.setTextInteractionFlags(Qt.TextSelectableByMouse)
-        grid.addWidget(QLabel(_("Amount to be sent") + ": "), 0, 0)
+        grid.addWidget(HelpLabel(_("Amount to be sent") + ": ", msg), 0, 0)
         grid.addWidget(self.amount_label, 0, 1)
 
         msg = _('Bitcoin transactions are in general not free. A transaction fee is paid by the sender of the funds.') + '\n\n'\

electrum/gui/qt/main_window.py

@@ -1369,10 +1369,11 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
         self.message_e = SizedFreezableLineEdit(width=700)
         grid.addWidget(self.message_e, 2, 1, 1, -1)
 
-        msg = _('Amount to be sent.') + '\n\n' \
-              + _('The amount will be displayed in red if you do not have enough funds in your wallet.') + ' ' \
-              + _('Note that if you have frozen some of your addresses, the available funds will be lower than your total balance.') + '\n\n' \
-              + _('Keyboard shortcut: type "!" to send all your coins.')
+        msg = (_('The amount to be received by the recipient.') + ' '
+               + _('Fees are paid by the sender.') + '\n\n'
+               + _('The amount will be displayed in red if you do not have enough funds in your wallet.') + ' '
+               + _('Note that if you have frozen some of your addresses, the available funds will be lower than your total balance.') + '\n\n'
+               + _('Keyboard shortcut: type "!" to send all your coins.'))
         amount_label = HelpLabel(_('Amount'), msg)
         grid.addWidget(amount_label, 3, 0)
         grid.addWidget(self.amount_e, 3, 1)