Rename gettext to cwgettext, use stdlib gettext cubicweb/gettext.py was a copy of Python 2.6's gettext.py with the context patch from bug https://bugs.python.org/issue2504 Instead of keeping that full copy, just inherit from gettext.GNUTranslations and add the context-related stuff.

for table, column in [
        ('transactions', 'tx_time'),
        ('tx_entity_actions', 'tx_uuid'),
        ('tx_relation_actions', 'tx_uuid')]:
    repo.system_source.create_index(session, table, column)

commit()