Describe the bug

There is an extra comma that is usually followed by the year, but since it is omitted it looks weird.
Steps to reproduce
- Create a new contact with a birthday date
- Tick the "Omit year" checkbox and save
Expected behavior
The comma shouldn't be there when viewing the contact birthday.
Actual behavior
There is a comma.
Contact version
6.1.0
Operating system
Alpine
PHP engine version
PHP 8.3
Web server
Nginx
Database
PostgreSQL
Additional info
No response