Comment 3 for bug 1631843

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BALLOON (balloon) wrote : Re: Cannot change file/folder's name in Japanese

Yes. I will reflect over there the Japanese information.

In the present situation is the solution means to substitute the other file manager.
If you installed the fcitx-frontend-gtk3, Files (ファイル) can operate normally:

    sudo apt install fcitx-frontnend-gtk3 (Restart required)

but in this case, it does not function fcitx input is part of the elementary OS applications. (ex. Scratch)
This must be replaced by other applications.