Following strings from LocalizedStrings.cpp need proper plurals handling, similarly to what "Use at least one character"/"Use at least %d characters" and "Use no more than one character"/"Use no more than %d characters" from the same file have: "%d files" "%s %d×%d pixels" "%1$d days %2$d hours %3$d minutes %4$d seconds" "%1$d hours %2$d minutes %3$d seconds" "%1$d minutes %2$d seconds" "%1$d seconds" "Use at least %d characters" "Use no more than %d characters" The time strings probably need to be split to pluralize correctly. Some general info on the topic: https://wiki.gnome.org/TranslationProject/DevGuidelines/Plurals
(Actually, the strings already using ngettext are in LocalizedStringsGtk.cpp, not LocalizedStrings.cpp.)