feat(AddPeopleDialog): Add config option to overwrite invite subject app name

config.js

     // Base URL for a Gravatar-compatible service. Defaults to libravatar.
     // gravatarBaseURL: 'https://seccdn.libravatar.org/avatar/',
 
+    // App name to be displayed in the invitation email subject, as an alternative to
+    // interfaceConfig.APP_NAME.
+    // inviteAppName: null,
+
     // Moved from interfaceConfig(TOOLBAR_BUTTONS).
     // The name of the toolbar buttons to display in the toolbar, including the
     // "More actions" menu. If present, the button will display. Exceptions are

react/features/base/config/configWhitelist.js

     'iAmSipGateway',
     'iceTransportPolicy',
     'ignoreStartMuted',
+    'inviteAppName',
     'liveStreamingEnabled',
     'localRecording',
     'maxFullResolutionParticipants',

react/features/invite/components/add-people-dialog/web/AddPeopleDialog.js

      */
     _invitationText: string,
 
+    /**
+     * An alternate app name to be displayed in the email subject.
+     */
+    _inviteAppName: ?string,
+
     /**
      * Whether or not invite contacts should be visible.
      */
     _urlSharingVisible,
     _emailSharingVisible,
     _invitationText,
+    _inviteAppName,
     _inviteContactsVisible,
     _inviteUrl,
     _liveStreamViewURL,
     }, []);
 
     const inviteSubject = t('addPeople.inviteMoreMailSubject', {
-        appName: interfaceConfig.APP_NAME
+        appName: _inviteAppName ?? interfaceConfig.APP_NAME
     });
 
     return (
 function mapStateToProps(state, ownProps) {
     const currentLiveStreamingSession
         = getActiveSession(state, JitsiRecordingConstants.mode.STREAM);
-    const { iAmRecorder } = state['features/base/config'];
+    const { iAmRecorder, inviteAppName } = state['features/base/config'];
     const addPeopleEnabled = isAddPeopleEnabled(state);
     const dialOutEnabled = isDialOutEnabled(state);
     const hideInviteContacts = iAmRecorder || (!addPeopleEnabled && !dialOutEnabled);
         _invitationText: getInviteText({ state,
             phoneNumber,
             t: ownProps.t }),
+        _inviteAppName: inviteAppName,
         _inviteContactsVisible: interfaceConfig.ENABLE_DIAL_OUT && !hideInviteContacts,
         _inviteUrl: getInviteURL(state),
         _liveStreamViewURL: