Is your feature request related to a problem? Please describe.

Missing support for the popular social network platform Instagram.

Describe the solution you'd like

Implement a notification service like we already did for [Telegram](https://github.com/nikoksr/notify/blob/main/service/telegram/telegra

At the moment there are no tests for most of the services, having tests for supported services will help greatly to keep the app stable.

Telegram
Slack
Pushover
Pushbullet
Ms Teams
RocketChat
Discord
Twillio

The tooltip for the dark mode toggle button is only in English and Russian. In any other language setting it stays in English.

It'd be great for users who are native speakers of the other languages offered in RocketChat to add translations to the tooltip to dark-mode-toggle.js. We need translations for:

• [