[MM-58549] Desktop login (#27732)

* desktop oauth and saml login
---------
Co-authored-by: Mattermost Build <build@mattermost.com>

server/i18n/en.json

@@ -4066,6 +4066,10 @@
     "id": "api.user.login_ldap.not_available.app_error",
     "translation": "AD/LDAP not available on this server."
   },
+  {
+    "id": "api.user.login_with_desktop_token.not_oauth_or_saml_user.app_error",
+    "translation": "User is not an OAuth or SAML user."
+  },
   {
     "id": "api.user.oauth_to_email.context.app_error",
     "translation": "Update password failed because context user_id did not match provided user's id."