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Adjectives in Norwegian (bokmål) can have either -e or -t as suffix, or they don't have any suffix. -t isn't used with adjectives ending with -ig or -sk, in any other case it is used with a noun in neuter genre.
The suffix -e is used either in plural or definite form of a noun.
In the phrase "norsk-engelsk oversettelse", the noun "oversettelse" is indefinite, and thus "norsk-engelsk" doesn't have any suffix.
"Den norske oversettelsen" is definite - "the norwegian translation". While using "den" or "det" before an adjective, or when adjective describes a definite noun, it has to be in definite form too: "den norske versjon", "den store krigen", "Den industrielle revolusjon".

Håpar at det hjelpa
MVH

Wow. Thanks for great answer! That make sense!