GNOME Bugzilla – Bug 782147
Plural forms in translatable strings
Last modified: 2017-05-22 03:12:42 UTC
msgid "You need to install the %s package(s)." The above string is from 'src/ui.vala', line 1800. It should use ngettext to properly handle plural forms in languages other than English. Here are some instructions on the topic: https://wiki.gnome.org/TranslationProject/DevGuidelines/Plurals
This problem has been fixed in the unstable development version. The fix will be available in the next major software release. You may need to upgrade your Linux distribution to obtain that newer version.