Fix log output and spelling

jupyterlab/commands.py

@@ -380,7 +380,7 @@ def list_extensions(app_dir=None, logger=None):
     # Handle uninstalled and disabled core packages
     uninstalled_core = _get_uinstalled_core_extensions(app_dir)
     if uninstalled_core:
-        logger.info('\nUninstalled core extensiosn:')
+        logger.info('\nUninstalled core extensions:')
         [logger.info('    %s' % item) for item in sorted(uninstalled_core)]
 
     core_extensions = _get_core_extensions()

jupyterlab/labextensions.py

@@ -41,6 +41,10 @@ class BaseExtensionApp(JupyterApp):
     should_build = Bool(False, config=True,
         help="Whether to build the app after the action")
 
+    def _log_format_default(self):
+        """A default format for messages"""
+        return "%(message)s"
+
 
 class InstallLabExtensionApp(BaseExtensionApp):
     description = "Install labextension(s)"