Thanks, @macmanx and @aoking, I went into Social Warfare plugin and changed the Pinterest settings, but it didn’t remove the strange ‘Save’ text that appears under each image.
Then I deactivated all my plugins and nothing changed: the words ‘Save Save Save’ are still located under every image on the site.
It makes me think that this text is not being dynamically generated, and that it has been left behind by some previous plugin that I was using for image optimization.
The way I’ve been getting rid of it is to replace each image with the version stored in the WP Media Library. But hat’s a time-consuming process. Can you think of any other options for removing the code?
Thanks in advance.