long description is not saved when creating conversation

[alexanderdd]

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Steps to reproduce

1. Create a new conversation, add title and a looong description (~1000 words), add participants, click "create"
2. conversation is created but the description is not saved, error message (German) "Fehler bei der Aktualisierung der Beschreibung"

Expected behaviour

There should be a warning that the description is too long, like when you edit a description of an existing conversation, it should show how many characters you have left or how many you are over the limit. The next step button at the bottom "add participants" should not be clickable until the description fits the limit.

Actual behaviour

Long description (=a lot of time writing) not saved, frustrated users.

versions

**Talk app version: 17.1.5

Nextcloud Version: 27.1.6