Use mono font for mnemonic text area and set it to readonly.

Signed-off-by: allexzander <blackslayer4@gmail.com>

src/gui/accountmanager.cpp

@@ -407,7 +407,11 @@ void AccountManager::displayMnemonic(const QString& mnemonic)
     ui.label->setText(tr("To protect your Cryptographic Identity, we encrypt it with a mnemonic of 12 dictionary words. "
                          "Please note these down and keep them safe. "
                          "They will be needed to add other devices to your account (like your mobile phone or laptop)."));
+    QFont monoFont(QStringLiteral("Monospace"));
+    monoFont.setStyleHint(QFont::TypeWriter);
+    ui.textEdit->setFont(monoFont);
     ui.textEdit->setText(mnemonic);
+    ui.textEdit->setReadOnly(true);
     ui.textEdit->focusWidget();
     ui.textEdit->selectAll();
     ui.textEdit->setAlignment(Qt::AlignCenter);