[Video] Captions and alt text (#5009)

* video settings modal in composer

* show done button on web

* rm download options

* fix logic for showing settings button

* add language picker (wip)

* subtitle list with language select

* send captions & alt text with video when posting

* style "ensure you have selected a language" text

* include aspect ratio with video

* filter out captions where the lang is not set

* rm log

* fix label and add hint

* minor scrubber fix

src/alf/atoms.ts

@@ -853,6 +853,7 @@ export const atoms = {
   mr_auto: {
     marginRight: 'auto',
   },
+
   /*
    * Pointer events & user select
    */
@@ -871,6 +872,7 @@ export const atoms = {
   user_select_all: {
     userSelect: 'all',
   },
+
   /*
    * Text decoration
    */
@@ -880,4 +882,11 @@ export const atoms = {
   strike_through: {
     textDecorationLine: 'line-through',
   },
+
+  /*
+   * Display
+   */
+  hidden: {
+    display: 'none',
+  },
 } as const