Possibility to configure an OpenID Connect provider on the instance level WIP (#128).

conversejs/builtin.ts

@@ -159,6 +159,7 @@ async function initConverse (
 
   // no viewer mode if authenticated.
   params.livechat_enable_viewer_mode = autoViewerMode && !isAuthenticated && !isRemoteWithNicknameSet
+  params.livechat_external_auth_oidc_button_label = initConverseParams.externalAuthOIDC?.buttonLabel
 
   if (chatIncludeMode === 'peertube-video') {
     params.livechat_mini_muc_head = true // we must replace the muc-head by the custom buttons toolbar.