MojiKurafuto

What it does

Set the game language to 日本語 and the mod puts furigana over every kanji you look at, hold or hover, adds romaji when you want it, and shows an English or Russian translation next to.

Look at something. Blocks, mobs, dropped items and water get a label at the top of the screen: the Japanese name with readings above the kanji and the translation beside it.