Hi, as clamm-san mentioned, some of us had the same issue but they seemed to solve it themselves. I would like to share the workarounds they tried for your reference.
-Download the official LocKit zip file.
-Upload that original zip file as-is.
-After you confirm the game properly displayed, unzip the zip file. Then, replace only translation.csv, and compress the folder. Once the folder is successfully compressed, upload it.
Also, one of the participants mentioned that they could not upload when they used LibreOffice but succeeded with notepad++. So maybe LibreOffice unexpectantly changes something in Japanese text.