qt: fix some strings for localization

closes https://github.com/spesmilo/electrum/issues/8919

electrum/gui/qt/update_checker.py

@@ -48,8 +48,8 @@ class UpdateCheck(QDialog, Logger):
         self.content.addWidget(self.pb)
 
         versions = QHBoxLayout()
-        versions.addWidget(QLabel(_("Current version: {}".format(version.ELECTRUM_VERSION))))
-        self.latest_version_label = QLabel(_("Latest version: {}".format(" ")))
+        versions.addWidget(QLabel(_("Current version: {}").format(version.ELECTRUM_VERSION)))
+        self.latest_version_label = QLabel(_("Latest version: {}").format(" "))
         versions.addWidget(self.latest_version_label)
         self.content.addLayout(versions)
 
@@ -81,7 +81,7 @@ class UpdateCheck(QDialog, Logger):
     def update_view(self, latest_version=None):
         if latest_version:
             self.pb.hide()
-            self.latest_version_label.setText(_("Latest version: {}".format(latest_version)))
+            self.latest_version_label.setText(_("Latest version: {}").format(latest_version))
             if self.is_newer(latest_version):
                 self.heading_label.setText('<h2>' + _("There is a new update available") + '</h2>')
                 url = "<a href='{u}'>{u}</a>".format(u=UpdateCheck.download_url)

electrum/gui/qt/util.py

@@ -176,7 +176,7 @@ class HelpButton(HelpMixin, QToolButton):
 
 class InfoButton(HelpMixin, QPushButton):
     def __init__(self, text: str):
-        QPushButton.__init__(self, 'Info')
+        QPushButton.__init__(self, _('Info'))
         HelpMixin.__init__(self, text, help_title=_('Info'))
         self.setFocusPolicy(Qt.NoFocus)
         self.setFixedWidth(6 * char_width_in_lineedit())