現げん代だい語ご訳やく

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Meanings

modern translation; translation into modern language

Refers to a translation of a classical or older Japanese text into contemporary Japanese, such as a modern version of The Tale of Genji.

〈物もの〉を現げん代だい語ご訳やくするto translate something (a classical text) into modern Japanese
源げん氏じ物もの語がたりを現げん代だい語ご訳やくする。
To translate The Tale of Genji into modern Japanese.
〈物もの〉の現げん代だい語ご訳やくa modern-language translation of something
この本ほんは枕草子まくらのそうしの現げん代だい語ご訳やくだ。
This book is a modern translation of The Pillow Book.

口こう語ご訳やく
現代語訳 specifically means rendering a classical text into contemporary Japanese, while 口語訳 more broadly means rendering formal or archaic language into colloquial speech, which may or may not be 'modern'.
翻ほん訳やくN4
翻訳 is the general word for translation between any two languages, whereas 現代語訳 narrowly means translating an old form of Japanese into modern Japanese.
意い訳やく
意訳 refers to a free, sense-for-sense translation style, while 現代語訳 refers to the goal of updating the language to modern usage, and the two can overlap but are not the same thing.

Compound of 現代語 (modern language) and 訳 (translation).