[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/view/com/util/post-embeds/VideoEmbedInner/VideoWebControls.tsx

@@ -557,7 +557,7 @@ function Scrubber({
             {backgroundColor: 'rgba(255, 255, 255, 0.4)'},
             {height: hovered || scrubberActive ? 6 : 3},
           ]}>
-          {currentTime > 0 && duration > 0 && (
+          {duration > 0 && (
             <View
               style={[
                 a.h_full,