UPD: deprecation warning will be displayed when use _()

Author: sngyo

jupyter_server/transutils.py

@@ -4,10 +4,18 @@
 # Distributed under the terms of the Modified BSD License.
 
 import os
+import warnings
 import gettext
 
 
+def _trans_gettext_deprecation_helper(*args, **kwargs):
+    warn_msg = "The alias `_()` will be deprecated. Use `_i18n()` instead."
+    warnings.warn(warn_msg, FutureWarning)
+    return trans.gettext(*args, **kwargs)
+
+
 # Set up message catalog access
 base_dir = os.path.realpath(os.path.join(__file__, '..', '..'))
 trans = gettext.translation('notebook', localedir=os.path.join(base_dir, 'notebook/i18n'), fallback=True)
+_ = _trans_gettext_deprecation_helper
 _i18n = trans.gettext