Missing translation term

Hi, i´m using the shortcode to show reviews.

In pagination I can see the “Show more” text button in spanish (nice). But when I click one time, then it changes to english, as I you can see in this short video.

https://drive.google.com/file/d/1m_l9atBSUwTympSJLa9S5nbOsVYq47MN/view?usp=sharing

*This ocurrs even when I´ve translated the 2 “Show more” strings in the translation file. I use Loco Tranlate. But this button is “Load more”, wich is not included in POT file.

Thanks in advance

Kind regards