enh(LobbySettings): add timezone and relative time

[DorraJaouad]

☑️ Resolves

• Fix Show timezone when setting lobby time #12027

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

very soon	soon	not in 24 hours

Lobby screen:

🏁 Checklist

• 🌏 Tested with Chrome, Firefox and Safari or should not be risky to browser differences
• 🖥️ Tested with Desktop client or should not be risky for it
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

[Antreesy]

Works good.
But I'd expect to see similar relative numbers in moderator dialog, and lobby waiting page. Maybe we should align the appearance in both places?

[Antreesy]

Works good. Not sure that missing minutes issue is related to changes, as computed value is correct

[ShGKme]

Not sure that missing minutes issue is related to changes, as computed value is correct

It is managed by this server code. If we live-relative-timestampwant to render time manually by Talk, then we need to remove this live-relative-timestamp class. Otherwise, I'd say, we should use nextcloud-vue component.

https://github.com/nextcloud/server/blob/3ad4bbb09692b180971e024ffeaab1d81fe77e4e/core/src/init.js#L42-L50

[DorraJaouad]

/backport to stable29