Custom Relationship type, eg. "Dog" is displayed in lowercase, ie. "dog"

Describe the bug

No response

Steps to reproduce

1. Go to "Contacts" app on /e/OS on an android phone
2. Edit any contact
3. Choose "More fields"
4. Enter a Relationship and choose type "Custom"
5. Enter a custom Relationship type, eg. "Dog"
6. Save the edit
7. On the phone, the Relationship type displays as "Dog"
8. On Nextcloud web (current Murena build, based on Nextcloud 29), it displays as "dog". The default Relationship types, such as "Child" display correctly:

9. Choose "Download" from the 3-dots menu
10. See that in the exported VCARD file, all Relationship types are stored lowercase. So to me it seems to be a "rendering" issue.

Excerpt of VCARD file:

RELATED;TYPE=spouse;VALUE=TEXT:TestName
RELATED;TYPE=child;VALUE=TEXT:TestName
RELATED;TYPE=child;VALUE=TEXT:TestName
RELATED;TYPE=dog;VALUE=TEXT:TestName

Expected behavior

Custom Relationship types should also display starting with a capital letter

Actual behavior

Custom Relationship types display in lowercase.

Contact version

? Nextcloud 29, Murena build

Operating system

? Murena build

PHP engine version

None

Web server

None

Database

None

Additional info

No response

Start by reproducing the custom Relationship type in the Contacts app and compare its web rendering with the downloaded VCARD output. Trace where custom relationship labels are displayed and exported; done means a value such as "Dog" retains its capitalization in the web interface and exported VCARD.