Wrong default date time format.

[kamilko]

Describe the Bug

In spreadsheet comments or tooltip long date is always formatted as M/D/Y type.

Steps to Reproduce

Have your zone date format as D/M/Y
Add comment (while doing this, comment date will be displayed properly)
Save comment and then display comment tooltip
Date format will be always as M/D/Y

Screenshots

Desktop

This was tested on many different version of Nextcloud as well as many different version of OS (mostly Debian and Ubuntu, also snap version of Nextcloud).
Also it doesn't matter what locale is on server or user system, as long it isn't M/D/Y.

Aditional info

I've opened issue in https://github.com/CollaboraOnline/richdocumentscode/ (CollaboraOnline/richdocumentscode#257) but was redirect to open issue in https://github.com/nextcloud/richdocuments (nextcloud/richdocuments#3447) but then was redirect here. So please don't redirect me with this issue to those two projects.

[timur-g]

Is this will Collabora installed from packages or used as Built-in in Nextcloud?