Fixed #23315: Operational dependency fail with mixed create/add
Fixed typo in 1.7 release notes
Added Chinese language aliases in tx client config

Transifex doesn't have zh_Hans/zh_Hant locales.
Forward port of c586fcd4eade5 from stable/1.7.x
Fetched translations from Transifex

Forward port of 49280a73ea5 from stable/1.7.x
Fixed migrations tests added in refs #23315.
Fixed flake8 warnings.
Added release note stubs for 1.5.9 and 1.4.14.
Prevented reverse() from generating URLs pointing to other hosts.

This is a security fix. Disclosure following shortly.
Fixed #23157 -- Removed O(n) algorithm when uploading duplicate file names.

This is a security fix. Disclosure following shortly.
Fixed #23066 -- Modified RemoteUserMiddleware to logout on REMOTE_USER change.

This is a security fix. Disclosure following shortly.
Prevented data leakage in contrib.admin via query string manipulation.

This is a security fix. Disclosure following shortly.
Fixed #23322 -- Use resolved swappable model for dependency resolution during makemigrations
Added dates to release notes.