@CrisQ About CalDAV for me is important because I have my calendar on my Nextcloud, so I want to sync all my devices (for example if I am not at home but I want add some task to do)
CalDAV is the standard protocol for this stuff: https://en.wikipedia.org/wiki/CalDAV
About i18t for me it's fine i want to learn chinese, but people cant understand chinese, so its better to fallback on eng lang if the target lang is not available?