Add list of lists component to web UI (#5811)

* Add list of lists component to web UI

* Add list adding

* Add list removing

* List editor modal

* Add API account search limited by following=true relation

* Rework list editor modal

* Remove mandatory pagination of GET /api/v1/lists/:id/accounts

* Adjust search input placeholder

* Fix rspec (#5890)

* i18n: (zh-CN) Add missing translations for #5811 (#5891)

* i18n: (zh-CN) yarn manage:translations -- zh-CN

* i18n: (zh-CN) Add missing translations for #5811

* Fix some issues

- Display loading/missing state for list timelines
- Order lists alphabetically in overview
- Fix async list editor reset
- Redirect to /lists after deleting unpinned list
- Redirect to / after pinning a list

* Remove dead list columns when a list is deleted or fetch returns 404

app/javascript/mastodon/reducers/index.js

@@ -23,6 +23,7 @@ import notifications from './notifications';
 import height_cache from './height_cache';
 import custom_emojis from './custom_emojis';
 import lists from './lists';
+import listEditor from './list_editor';
 
 const reducers = {
   timelines,
@@ -49,6 +50,7 @@ const reducers = {
   height_cache,
   custom_emojis,
   lists,
+  listEditor,
 };
 
 export default combineReducers(reducers);