feat(dialogs): port Gtk.FileChooserDialog to Gtk.FileChooserNative

src/window.py

@@ -213,17 +213,17 @@ class JournableWindow(Gtk.ApplicationWindow):
             self.let_user_save_changes()
 
         if not self.has_unsaved_changes:
-            file_chooser = Gtk.FileChooserDialog(
+            file_chooser = Gtk.FileChooserNative.new(
                 'Choose a file',
                 self,
                 Gtk.FileChooserAction.OPEN,
-                (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
-                 Gtk.STOCK_OPEN, Gtk.ResponseType.OK)
+                "_Open",
+                "_Cancel"
             )
             self.add_filters(file_chooser)
             response = file_chooser.run()
 
-            if response == Gtk.ResponseType.OK:
+            if response == Gtk.ResponseType.ACCEPT:
                 filename = file_chooser.get_filename()
                 self.load_file_content(filename)
                 self.update_file_information(filename)
@@ -232,16 +232,16 @@ class JournableWindow(Gtk.ApplicationWindow):
             file_chooser.destroy()
 
     def save_file_as(self):
-        file_chooser = Gtk.FileChooserDialog(
+        file_chooser = Gtk.FileChooserNative.new(
                 'Save as',
                 self,
                 Gtk.FileChooserAction.SAVE,
-                (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
-                 Gtk.STOCK_SAVE, Gtk.ResponseType.OK)
+                "_Save",
+                "_cancel"
             )
         self.add_filters(file_chooser)
         response = file_chooser.run()
-        if response == Gtk.ResponseType.OK:
+        if response == Gtk.ResponseType.ACCEPT:
             filename = file_chooser.get_filename()
             if not filename.endswith('.json'):
                 filename += '.json'