I have patched message notify such that it supports translated messages:
https://www.drupal.org/node/2177929#comment-9150847 →
Plus I have patched message subscribe for this as well:
https://www.drupal.org/node/2391345 →
But for this to work in combination with message digest we need a patch here as well.
Next comment contains the patch. I also fixed a bug because somewhere $languages was used but it is never defined.
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