5.6.0

What's Changed

• add 2 factor auth by @rafsaf in #551
• 2fa - fix typo in base.html by @rafsaf in #552
• fix "back" translation collision by @rafsaf in #553
• add optional sentry sdk setup by @rafsaf in #554
• enforce unique username instead of email by @rafsaf in #555
• improve sending message docs by @rafsaf in #556

Full Changelog: 5.5.1...5.6.0