3D FlipBook - Problem with translation

Hello,

I'm trying to translate the extension's character fields from the .POT file into the site's internal files (from Filezilla) but by modifying the fields nothing happens on my website.

I've cleared the cache, but nothing happens. We use "Loco Translate" as a translation extension, but the changes appear in the source code from the extension, and nothing happens.

Do you have any idea what's causing the problem?