1 new exercise: protein-translation

Programming COBOL
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Adding 1 new exercise to COBOL track: protein-translation

Based on last pull request attempt, all GOBACKs have been removed from code.

Thanks to @kapitaali for this contribution. Any comments?

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1 new exercise: protein-translation by kapitaali · Pull Request #125 · exercism/cobol · GitHub to link back to the exercise.