Mystery text in product price block > how to remove?

[3sverhaeghe]

Here's a snapshot of what the front end of the webshop shows (Prestashop 1.6.1.1) in the price block on the product page. The text highlighted in yellow is a mystery: it hasn't been entered by us (it's in Swedish), I had to look up the word, it means something like "monthly price" which is ridiculous as the price we're showing is the one-off purchase price for a virtual product.

I've searched the shop translations over and over again, it doesn't show up there anywhere. I would like to remove or modify this text because a Dutch-language site with text in Swedish on it looks amateurish and sloppy.

I imagine it's somewhere in the source files, but I don't know where to start.

Any ideas, anyone?

Edited June 15, 2020 by 3sverhaeghe (see edit history)