feat(config): Add config option for e2ee label

config.js

      disableRemoteControl
      displayJids
      externalConnectUrl
+     e2eeLabel
      firefox_fake_device
      googleApiApplicationClientID
      iAmRecorder

lang/main.json

         "displayNameRequired": "Hi! What’s your name?",
         "done": "Done",
         "e2eeDescription": "End-to-End Encryption is currently EXPERIMENTAL. Please keep in mind that turning on end-to-end encryption will effectively disable server-side provided services such as: phone participation. Also keep in mind that the meeting will only work for people joining from browsers with support for insertable streams.",
+        "e2eeDescriptionCustom": "{{label}} is currently EXPERIMENTAL. Please keep in mind that turning on {{label}} will effectively disable server-side provided services such as: phone participation. Also keep in mind that the meeting will only work for people joining from browsers with support for insertable streams.",
         "e2eeLabel": "Enable End-to-End Encryption",
+        "e2eeLabelCustom": "Enable {{label}}",
         "e2eeWarning": "WARNING: Not all participants in this meeting seem to have support for End-to-End encryption. If you enable it they won't be able to see nor hear you.",
+      "e2eeWarningCustom": "WARNING: Not all participants in this meeting seem to have support for {{label}}. If you enable it they won't be able to see nor hear you.",
         "enterDisplayName": "Enter your name here",
         "embedMeeting": "Embed meeting",
         "error": "Error",

react/features/base/config/configWhitelist.js

     'doNotStoreRoom',
     'doNotFlipLocalVideo',
     'dropbox',
+    'e2eeLabel',
     'e2eping',
     'enableDisplayNameInStats',
     'enableEmailInStats',

react/features/e2ee/components/E2EESection.js

 
 type Props = {
 
+    /**
+     * Custom e2ee label.
+     */
+    _e2eeLabel: string,
+
     /**
      * Whether E2EE is currently enabled or not.
      */
      * @returns {ReactElement}
      */
     render() {
-        const { _everyoneSupportE2EE, t } = this.props;
+        const { _e2eeLabel, _everyoneSupportE2EE, t } = this.props;
         const { enabled } = this.state;
-        const description = t('dialog.e2eeDescription');
+        let description;
+        let label;
+        let warning;
+
+        if (_e2eeLabel) {
+            description = t('dialog.e2eeDescriptionCustom', { label: _e2eeLabel });
+            label = t('dialog.e2eeLabelCustom', { label: _e2eeLabel });
+            warning = t('dialog.e2eeWarningCustom', { label: _e2eeLabel });
+        } else {
+            description = t('dialog.e2eeDescription');
+            label = t('dialog.e2eeLabel');
+            warning = t('dialog.e2eeWarning');
+        }
 
         return (
             <div id = 'e2ee-section'>
                     id = 'e2ee-section-description'>
                     { description }
                     { !_everyoneSupportE2EE && <br /> }
-                    { !_everyoneSupportE2EE && t('dialog.e2eeWarning') }
+                    { !_everyoneSupportE2EE && warning }
                 </p>
                 <div className = 'control-row'>
                     <label htmlFor = 'e2ee-section-switch'>
-                        { t('dialog.e2eeLabel') }
+                        { label }
                     </label>
                     <Switch
                         id = 'e2ee-section-switch'
  */
 function mapStateToProps(state) {
     const { enabled } = state['features/e2ee'];
+    const { e2eeLabel } = state['features/base/config'];
 
     return {
+        _e2eeLabel: e2eeLabel,
         _enabled: enabled,
         _everyoneSupportE2EE: doesEveryoneSupportE2EE(state)
     };