Untranslatable sentence missing %d: _"Created " (number->string sheet-num) _" contact sheets from a total of " (number->string img-count) _" images"
Could you please make a full sentence with %d.
This part of your code is really hard to translate to another language.
(display (string-append _"Created " (number->string sheet-num)
_" contact sheets from a total of "
(number->string img-count) _" images"))
https://gitlab.gnome.org/GNOME/gimp-tiny-fu/blob/master/scripts/contactsheet.scm
Edited by Andre Klapper