use the word 'extension' instead of 'passphrase'

gui/qt/installwizard.py

@@ -256,7 +256,7 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
             vbox.addStretch(1)
             vbox.addWidget(QLabel(_('Options') + ':'))
         if self.opt_ext:
-            cb_pass = QCheckBox(_('Add a passphrase to this seed'))
+            cb_pass = QCheckBox(_('Add an extension to this seed'))
             vbox.addWidget(cb_pass)
         if self.opt_bip39:
             def f(b):
@@ -325,7 +325,7 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
         vbox.addLayout(slayout.layout())
         vbox.addStretch(1)
         vbox.addWidget(QLabel(_('Option') + ':'))
-        cb_pass = QCheckBox(_('Add a passphrase to this seed'))
+        cb_pass = QCheckBox(_('Add an extension to this seed'))
         vbox.addWidget(cb_pass)
         self.set_main_layout(vbox)
         return cb_pass.isChecked()

gui/qt/seed_dialog.py

@@ -152,7 +152,7 @@ class ShowSeedLayout(SeedLayoutBase):
             passphrase_e = QLineEdit()
             passphrase_e.setText(passphrase)
             passphrase_e.setReadOnly(True)
-            hbox.addWidget(QLabel('Your seed passphrase is'))
+            hbox.addWidget(QLabel('Your seed extension is') + ':')
             hbox.addWidget(passphrase_e)
             vbox.addLayout(hbox)
         msg = seed_warning_msg(seed)

lib/base_wizard.py

@@ -249,16 +249,16 @@ class BaseWizard(object):
         self.on_keystore(k)
 
     def passphrase_dialog(self, run_next):
-        title = _('Passphrase')
+        title = _('Seed extension')
         message = '\n'.join([
-            _('You may extend your seed with a passphrase.'),
-            _('The passphrase must be saved together with your seed.'),
+            _('You may extend your seed with custom words.'),
+            _('Your seed extension must be saved together with your seed.'),
         ])
         warning = '\n'.join([
             _('Note that this is NOT your encryption password.'),
             _('If you do not know what this is, leave this field empty.'),
         ])
-        self.line_dialog(title=_('Passphrase'), message=message, warning=warning, default='', test=lambda x:True, run_next=run_next)
+        self.line_dialog(title=title, message=message, warning=warning, default='', test=lambda x:True, run_next=run_next)
 
     def restore_from_seed(self):
         self.opt_bip39 = True
@@ -374,9 +374,9 @@ class BaseWizard(object):
     def confirm_passphrase(self, seed, passphrase):
         f = lambda x: self.run('create_keystore', seed, x)
         if passphrase:
-            title = _('Confirm Passphrase')
+            title = _('Confirm Seed Extension')
             message = '\n'.join([
-                _('Your passphrase must be saved together with your seed.'),
+                _('Your seed extension must be saved together with your seed.'),
                 _('Please type it here.'),
             ])
             self.line_dialog(run_next=f, title=title, message=message, default='', test=lambda x: x==passphrase)