OS: Ubuntu 16.04.5 LTS
Language: German (de-DE)
Installation directory: /srv/nodebb/
Guide used: https://docs.nodebb.org/installing/os/ubuntu/
Following strings are not definied outside of en-GB:
(And this, although it didn't cause any error till now) pages:account/watched_categories
And according to my grep inside
nodebb/public/language/, only en-GB has this translation, while other languages don't. This string is translated to German on Transifex. Yet it's not implemented into the latest installation and causes errors and weird bugs on the link for watched categories on the profile when using non en-GB languages.