Port f66a786029 to glitch-soc

Port 478ca39e5e to glitch-soc

Port front-end changes from f7765acf9d to glitch-soc

Port 25b0d7538e to glitch-soc

Port front-end changes from c36b9cc5a6 to glitch-soc

Port front-end changes from c083816c24 to glitch-soc

* Add force_login option to OAuth authorize page

For when a user needs to sign into an app from multiple accounts
on the same server

* When logging out from modal header, redirect back after re-login

* RU: Fixed typos and wrong translations

* RU: Added missing "chosen_languages" string

* RU: Fixed translation for "Features" tab in Admin Dashboard

* Shortened "Mobile apps" string, lowercased "following" string (it needs plurals btw), fixed typo at "copy" string.

* Fixed "media only" string, shortened "Content warning" placeholder, edited "mute thread" translation

* RU: Fixed "Reply to all" translation, Re-worded "short description" translation

You currently need to enable `layout.css.scrollbar-colors.enabled` in `about:config` in Firefox
Nightly.

Port f08e6e9ab5 to glitch-soc

Fixes #7380.

Will clear the browser's cache, cookies and storage.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Clear-Site-Data
https://w3c.github.io/webappsec-clear-site-data/

* Added Czech language option

* Added Czech language option

* Add Czech locale data

* Delete duplicate locale-data/cs.js

Duplicate locale-data is ignored in Mastodon.

see https://github.com/tootsuite/mastodon/blob/v2.5.0/config/webpack/generateLocalePacks.js#L25-L35

Inspired from 0bfa0f2374

If the current logged-in user is an admin, add quick links to the admin
interface in account and toot dropdown menu. Suggestion by @ashkitten

Port a060beee72 to glitch-soc

Port 7c12c7b124 to glitch-soc

Port 1bfe735d57 to glitch-soc

Fixes #700