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Because German and English work differently in this respect.
German generally leaves out the indefinite article before professions, roles, nationalities, but English does not. We say Ich bin Arzt, ich bin Vater, ich bin Türke in German but in English it's "I'm a doctor, I'm a father, I'm a Turk".
I agree, but I imagine the authors wanted to preserve the grammatical structure across languages, hence why we see a noun rather than an adjective. Then again, they ended up having to add an indefinite article which is not in the German sentence anyway. That's a weak point in my theory.