LucasRoesler opened a new issue, #56761:
URL: https://github.com/apache/airflow/issues/56761
### Apache Airflow version
3.1.0
### If "Other Airflow 2/3 version" selected, which one?
_No response_
### What happened?
I just recently looked into upgrading from 3.0.6 to 3.1.0.
When I start airflow using `airflow standalone`, everything starts as
expected and the login screen worked, but after login the screen is blank and
the browser console contains this error
```
Uncaught TypeError: invalid element in locales argument
mrr http://localhost:8080/static/assets/index-DCQjDg3C.js:25
lcr http://localhost:8080/static/assets/index-DCQjDg3C.js:40
Put http://localhost:8080/static/assets/index-DCQjDg3C.js:70
Srt http://localhost:8080/static/assets/index-DCQjDg3C.js:70
Egn http://localhost:8080/static/assets/index-DCQjDg3C.js:70
Wgn http://localhost:8080/static/assets/index-DCQjDg3C.js:70
Lwr http://localhost:8080/static/assets/index-DCQjDg3C.js:70
wZe http://localhost:8080/static/assets/index-DCQjDg3C.js:70
Hgn http://localhost:8080/static/assets/index-DCQjDg3C.js:70
rbn http://localhost:8080/static/assets/index-DCQjDg3C.js:70
jn http://localhost:8080/static/assets/index-DCQjDg3C.js:55
EventHandlerNonNull*
http://localhost:8080/static/assets/index-DCQjDg3C.js:55
<anonymous> http://localhost:8080/static/assets/index-DCQjDg3C.js:55
```
### What you think should happen instead?
The UI should load without errors.
### How to reproduce
1. First create and start a fresh Airflow environment
```bash
uv init --no-package --python 3.12 --name airflow-bug --no-readme
airflow-bug
cd airflow-bug
uv add "apache-airflow==3.1.0"uv
mkdir local
echo '{"admin": "admin"}' >
local/simple_auth_manager_passwords.json.generated
AIRFLOW_HOME=$(pwd)/local uv run airflow standalone
```
2. open http://localhost:8080
3. login with `admin:admin`
4. See a blank screen
5. open the browser console to see the error message about locales
### Operating System
Linux, Fedora 42
### Versions of Apache Airflow Providers
```
$ uv pip freeze | grep apache-airflow
apache-airflow==3.1.0
apache-airflow-core==3.1.0
apache-airflow-providers-common-compat==1.7.4
apache-airflow-providers-common-io==1.6.3
apache-airflow-providers-common-sql==1.28.1
apache-airflow-providers-smtp==2.3.1
apache-airflow-providers-standard==1.9.0
apache-airflow-task-sdk==1.1.0
```
### Deployment
Virtualenv installation
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [x] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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