Threema Gateway supports two types of IDs: Basic IDs (where the
encryption is managed by the API server) and End-to-End IDs (where the
keys are managed by the user).
This plugin currently does not support End-to-End IDs (since it's much
more complex to implement, because the encryption needs to happen
locally). Add a few clarifications to the UI.
Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>