May 28 20:31:44 node IDP[1409]: 4 [5a4599408b] The translation file at /apps/installation/simplesamlphp/simplesamlphp-2.4.1/modules/themetim/locales/nl/LC_MESSAGES has domain messages but is expected to have a domain themetim

This message should not be emitted for a theme-module, because themes don't define their own translation domains, but instead override translations for other domains.

It is thrown here:

The IF-statement needs an extra condition "if $domain != {configured theme}"