I solved my problem.
Well, sort of. I changed my user language, in my profile from en_US back to en_GB.
Now my two-factor and user invitation plugin display properly.
But, why did my user profile language change? I do not recall changing it. Maybe I did at some point and I just do not recall. The last plugin I installed prior to today was the nodebb-plugin-newsletter to test it for the developer, in another thread.
I un-installed that plugin and it did not make a difference but that is when I noticed my user profile language was set to en_US.
@yariplus Great thanks for these insights.
Actually I see two types of groups:
Settings > Group (in our case these are Guests and Registered-user for example)
Manage menu > Groups (in our case these are Ambassadors and Administrators for example)
So when I manage the category I can only manage the first type of group but not the latter that interests me the most.
For example, I wish I could have a private category for Ambassadors. As we have a group of over 100 volunteers and I'll have to add them manually already once to the second type of group, I wish I didn't have to repeat that process to add them to the private category.
Is there a way to avoid that process?
Also why are the two groups name similarly when they are two different things?