web: UI Locale Fixes (cherry-pick #19235 to version-2025.12)

[authentik-automation]

⚠️ This cherry-pick has conflicts that require manual resolution.

Cherry-pick of #19235 to version-2025.12 branch.

Original PR: #19235
Original Author: @GirlBossRush
Cherry-picked commit: c2db63a

Please resolve the conflicts in this PR before merging.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.27%. Comparing base (d06091e) to head (e767840).
⚠️ Report is 1 commits behind head on version-2025.12.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           version-2025.12   #19384      +/-   ##
===================================================
- Coverage            93.27%   93.27%   -0.01%     
===================================================
  Files                  946      946              
  Lines                52155    52155              
===================================================
- Hits                 48649    48648       -1     
- Misses                3506     3507       +1     

Flag	Coverage Δ
e2e	44.63% <ø> (-0.02%)	⬇️
integration	23.45% <ø> (+<0.01%)	⬆️
unit	91.54% <ø> (ø)
unit-migrate	91.59% <ø> (ø)

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[github-actions]

authentik PR Installation instructions

Instructions for docker-compose

Add the following block to your .env file:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-e7678400bc986a528a05032a9cf19a7234a09fc9
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

Afterwards, run the upgrade commands from the latest release notes.

Instructions for Kubernetes

Add the following block to your values.yml file:

authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-e7678400bc986a528a05032a9cf19a7234a09fc9

Afterwards, run the upgrade commands from the latest release notes.