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書かれてる

is written, has been written

→ 書く
書か to write + れ Passive voice + てる Progressive aspect
verb · informal, present tense Rare #40,019
is written, has been written Colloquial contraction of 書かれている.
JA: この本は日本語で書かれてる。
EN: This book is written in Japanese.
Conjugation of 書く
Present
書く書かれてる

この本は、スペイン語で書かれてるんだ。

This book is written in Spanish.

手紙に書かれてるのは彼女の恋人の名前

What's written in the letter is her lover's name.

— マレーナ (2000)

壁にはたくさんの名前が書かれてるわ！

There are so many names written on the wall!

— 甘い生活 (1960)

この本はフランス語で書かれてるよ。

This book is written in French.