diff --git a/stt_voice_messages/gtk/config_dialog.py b/stt_voice_messages/gtk/config_dialog.py
index 070d750..e88b77f 100644
--- a/stt_voice_messages/gtk/config_dialog.py
+++ b/stt_voice_messages/gtk/config_dialog.py
@@ -40,7 +40,6 @@ if TYPE_CHECKING:
 
 log = logging.getLogger('gajim.p.sttvm_config_dialog')
 
-
 SUPPORTED_MODELS: dict[str, dict[str, typing.Union[list[str], Any, str]]] = {
     'model_openaiwhisper': {
         'moduls': ['whisper'],
@@ -72,20 +71,25 @@ class Configuration:
         self._available_models: dict[
             str, dict[str, typing.Union[list[str], Any, str]]] = {}
         self.check_available_moduls()
-            
+
     @property
     def plugin(self) -> STTVoiceMessagesPlugin:
         return self._plugin
 
     @property
-    def available_models(self) -> dict[str, dict[str, typing.Union[list[str], Any, str]]]:
+    def available_models(self) -> dict[
+        str, dict[str, typing.Union[list[str], Any, str]]]:
         return self._available_models
 
     def on_setting(self, value: Any, data: Any) -> None:
         if isinstance(value, str):
             value.strip()
+
         log.debug('plugin config before:\n %s', self.plugin.config.data)
+        # TODO: Is 'modelname_key = value' a good design?
         self.plugin.config[data] = value
+
+        # TODO: Apply setting only to specific instance
         self._plugin.config['model_instance'].on_setting(data, value)
         log.debug('plugin config after:\n %s', self.plugin.config.data)
 
@@ -94,11 +98,13 @@ class Configuration:
             value.strip()
         log.debug('plugin config before:\n %s', self.plugin.config.data)
 
-        self._available_models[value]['model_instance'] = self._available_models[value]['class']()
+        self._available_models[value]['model_instance'] = \
+        self._available_models[value]['class']()
 
         self.plugin.config['model_class'] = self._available_models[value][
             'class']
-        self.plugin.config['model_instance'] = self._available_models[value]['model_instance']
+        self.plugin.config['model_instance'] = self._available_models[value][
+            'model_instance']
 
         self.on_setting(value, data)
         log.debug('plugin config after:\n %s', self.plugin.config.data)
@@ -136,7 +142,6 @@ class Configuration:
         log.debug('models = %s', self._available_models)
 
 
-
 class PreferenceBox(SettingsBox):
     def __init__(self, settings: list[Setting]) -> None:
         SettingsBox.__init__(self, None)
@@ -185,7 +190,6 @@ class STTVoiceMessagesConfigDialog(Gtk.ApplicationWindow):
 
     class STTBehaviour(PreferenceBox):
         def __init__(self, config_dialog: STTVoiceMessagesConfigDialog) -> None:
-
             settings = [
                 Setting(SettingKind.SWITCH,
                         _('Auto Transcribe'),
@@ -220,12 +224,12 @@ class STTVoiceMessagesConfigDialog(Gtk.ApplicationWindow):
 
     class OpenAIWhisperGeneral(PreferenceBox):
         def __init__(self, config_dialog: STTVoiceMessagesConfigDialog) -> None:
-
             settings = [
                 Setting(SettingKind.POPOVER,
                         _('Language Model Size'),
                         SettingType.VALUE,
-                        value=config_dialog.plugin.config['whisperai_model_size'],
+                        value=config_dialog.plugin.config[
+                            'whisperai_model_size'],
                         data='whisperai_model_size',
                         callback=config_dialog.config.on_setting,
                         props={'entries': whisper.available_models()}),
@@ -233,7 +237,8 @@ class STTVoiceMessagesConfigDialog(Gtk.ApplicationWindow):
                 Setting(SettingKind.SWITCH,
                         _('Translate'),
                         SettingType.VALUE,
-                        value=config_dialog.plugin.config['whisperai_translate'],
+                        value=config_dialog.plugin.config[
+                            'whisperai_translate'],
                         data='whisperai_translate',
                         callback=config_dialog.config.on_setting)
             ]
@@ -246,5 +251,3 @@ class STTVoiceMessagesConfigDialog(Gtk.ApplicationWindow):
             pref = klass(self)  # pyright: ignore
             pref_box.add(pref)
             self._prefs[ui_name] = pref
-
-