How do I translate “Read more”? Where do I have to edit the theme?
It depends on the theme. For example, in the current version of the default Casper theme, Read More is on the file partials/byline-single.hbs.
The WorldCasper2 theme, translatable version of Casper, replaces it with {{t "Read More"}} following Ghost’s internationalization (i18n) system.
See Theme translations and blog localisation for an introduction.
Juan, thank you very much. I appreciate your concern. Best wishes, Tiago