Although I find YAML a lot better, GNOME Builder sadly doesn't support
it: https://gitlab.gnome.org/GNOME/gnome-builder/issues/520

This essentially reverts 5fc6b517, but
also updates some dependencies.

Also move shared pytest fixtures to conftest.py

https://docs.python.org/3/library/random.html#random.choices

Also randomly generate an auth_token now.

https://github.com/PyCQA/pylint/issues/2108

Also tested this by translating a little bit to German and Spanish.

Source: https://code.briarproject.org/briar/briar/blob/release-1.1.7/briar-android/artwork/logo_circle.svg

Also listen on other enter button and empty entry after sending.