ubiquity-slideshow-ubuntu is a different package, not part of ubuntu-docs. In this case, just don't translate that part of the string. As far as I know, it's not invalid to use an em-dash.
ubiquity- slideshow- ubuntu is a different package, not part of ubuntu-docs. In this case, just don't translate that part of the string. As far as I know, it's not invalid to use an em-dash.