it was the case that the language string for Exceptions was not resolved successfully in some cases. Now we switch to passing the internal string via Exceptions which then will be used to translate to the correct language when needed
This currently depends of interacting with matrix_synapse_rest_auth[1] and mxisd[2]. How to integrate that is explained in the README [1] https://github.com/kamax-io/matrix-synapse-rest-auth [2] https://github.com/kamax-io/mxisd
