Here is a translation of “Hello, dear journal, it is Scotto again” into Japanese:

「こんにちは、愛する日記、またスコットです」(konnichiwa, aisuru nikki, mata sukotto desu)

The greeting “konnichiwa” means “hello,” and “aisuru nikki” means “dear journal.” “Mata” means “again,” and “sukotto desu” is a way of saying “it is Scotto.” The final verb “desu” is a copula, similar to “is” in English, that is used to connect the subject of a sentence to a predicate.