[WEB] add UI for transcription (#3213)

* [WEB] add UI for transcription

* add analytics event for button, do not use global APP object

* use props instead of state, use local conference to kick participant

* put imports in alphabetical order

* add translation for TranscribingLabel

* fix merge conflict

* add closed caption button

* purge OverFlowMenuItem which starts and stops Transcription

* readd closed caption icon and fix small issues due to purge

* delete unused icon in _font.scss

conference.js

@@ -72,6 +72,8 @@ import {
     getAvatarURLByParticipantId,
     getLocalParticipant,
     getParticipantById,
+    hiddenParticipantJoined,
+    hiddenParticipantLeft,
     localParticipantConnectionStatusChanged,
     localParticipantRoleChanged,
     MAX_DISPLAY_NAME_LENGTH,
@@ -1654,10 +1656,13 @@ export default {
         room.on(JitsiConferenceEvents.PARTCIPANT_FEATURES_CHANGED,
             user => APP.UI.onUserFeaturesChanged(user));
         room.on(JitsiConferenceEvents.USER_JOINED, (id, user) => {
+            const displayName = user.getDisplayName();
+
             if (user.isHidden()) {
+                APP.store.dispatch(hiddenParticipantJoined(id, displayName));
+
                 return;
             }
-            const displayName = user.getDisplayName();
 
             APP.store.dispatch(participantJoined({
                 botType: user.getBotType(),
@@ -1682,8 +1687,11 @@ export default {
 
         room.on(JitsiConferenceEvents.USER_LEFT, (id, user) => {
             if (user.isHidden()) {
+                APP.store.dispatch(hiddenParticipantLeft(id));
+
                 return;
             }
+
             APP.store.dispatch(participantLeft(id, room));
             logger.log('USER %s LEFT', id, user);
             APP.API.notifyUserLeft(id);

config.js

@@ -175,6 +175,10 @@ var config = {
     // Whether to enable live streaming or not.
     // liveStreamingEnabled: false,
 
+    // Transcription (in interface_config,
+    // subtitles and buttons can be configured)
+    transcribingEnabled: false,
+
     // Misc
 
     // Default value for the channel "last N" attribute. -1 for unlimited.

css/_font.scss

@@ -24,6 +24,7 @@
     -webkit-font-smoothing: antialiased;
     -moz-osx-font-smoothing: grayscale;
 }
+
 .icon-arrow_back:before {
   content: "\e5c4";
 }
@@ -216,3 +217,6 @@
 .icon-tiles-one:before {
   content: "\e92f";
 }
+.icon-closed_caption:before {
+    content: "\e930";
+}