I got the following error in BO external contact after clicking on address (in 2017.3, only with german language):
".... not enough cosing parenthesis."
Support confirms bug, but development has no time until more customers have the same problem.
So I had a look how o fix this:
in BO external contact
quick Action "get address popup view"
1. I deletet the "Address1State (State)" line (I dont need US states)
2. go to edit translations, in the line Country, change the german translation "aus" back to "of" plus quotes and comma
should look like this