Alias ugettext to gettext method of cwGNUTranslations in Python 3 The former does not exist in Python 3, but we rely on it. This fixes test_login_bad_password in cubicweb/pyramid/test/test_login.py which has never passed since being introduced in 6392f34fcdad.

[devctl] make i18n custom message extractors work with legacy layouts distname needs to be "cubicweb_<cubename>", even with legacy layouts for pkg.load_entry_point() to work closes #16272177

Fix (new) flake8 errors They showed up on upgrade of flake8/pep8.

[pyramid] Try "eid" first when retrieving a subresource of ETypeResource So that Pyramid traversal works as existing CubicWeb URL publishing.

Fix AttributeError on postcommit when db-create adds non-system CWSource entities In this case, `Repository.add_source` is called from an operation, not from `Repository.init_sources_from_database`, thus the attribute `sources_by_eid` does not exist. Closes #16251078.

[devctl] Optimize cleanup_sys_modules a bit by moving out of a loop a costly computation that is constant. This at least benefits the `i18ncube` command. Related to #15789486.

[pyramid] Install file listing monitored files in application home Instead of using a temporary file, that never gets deleted. Closes #16159807.

[pyramid] Fix login error message language Use http negotiation unless language is explicitly set for the site. Closes #16236485.

i18n update Pyramid-related messages were not translated. Closes #16236243.

[pyramid] Add action verb used in some messages displayed by the command For instance we'll see 'instance started' instead of 'instance None', which is nicer.