Display launcher errors in Greenlight (#742)

app/controllers/sessions_controller.rb

@@ -57,7 +57,11 @@ class SessionsController < ApplicationController
 
   # POST /auth/failure
   def omniauth_fail
-    redirect_to root_path, alert: I18n.t(params[:message], default: I18n.t("omniauth_error"))
+    if params[:message].nil?
+      redirect_to root_path, alert: I18n.t("omniauth_error")
+    else
+      redirect_to root_path, alert: I18n.t("omniauth_specific_error", error: params["message"])
+    end
   end
 
   # GET /auth/ldap

config/locales/en.yml

@@ -333,6 +333,7 @@ en:
   name_update_success: Room name successfully changed!
   no_user_email_exists: There is no existing user with the email specified. Please make sure you typed it correctly.
   omniauth_error: An error occured while authenticating with omniauth. Please try again or contact an administrator!
+  omniauth_specific_error: "%{error} occured while authenticating with omniauth. Please try again or contact an administrator!"
   pagy:
     nav:
       prev: "‹ Prev"