"The captain is brave and the first officer is also brave."
Translation:yoH HoD 'ej yoH yaS wa'DIch je.
This sentence contains an error. The je needs to go after the verb, not after the subject. je after a verb is an advebial meaning also, too.
yoH HoD 'ej yoH je yaS wa'DIch.
The sentence is, of course, redundant, because either of these would mean the same thing:
yoH HoD 'ej yoH yaS wa'DIch.
yoH HoD; yoH je yaS wa'DIch.
But in this respect it's not technically wrong. We don't know if Klingon emphasizes the way English does with and also.