### Bug description After adding ` LANGUAGES = { "ru": {"flag": "ru", "name": "Russian"}, "en": {"flag": "us", "name": "English"} } BABEL_DEFAULT_LOCALE = "ru" ` to the file, the language selection appeared, but selecting it produces an error in the logs. <img width="957" height="247" alt="Image" src="https://github.com/user-attachments/assets/94d54c4f-733a-4db9-b5ac-6758041ca192" /> <img width="957" height="145" alt="Image" src="https://github.com/user-attachments/assets/a15f5ae5-d7d3-4837-8397-b08e3b311fe6" /> **### To reproduce:** git clone https://github.com/apache/superset.git in file superset_config.py ``` LANGUAGES = { "ru": {"flag": "ru", "name": "Russian"}, "en": {"flag": "us", "name": "English"} } BABEL_DEFAULT_LOCALE = "ru" ``` docker compose -f docker-compose-non-dev.yml up ### Screenshots/recordings _No response_ ### Superset version master / latest-dev ### Python version 3.9 ### Node version 16 ### Browser Chrome ### Additional context _No response_ ### Checklist - [x] I have searched Superset docs and Slack and didn't find a solution to my problem. - [x] I have searched the GitHub issue tracker and didn't find a similar bug report. - [ ] I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.