Hello, Recently, thanks to the help from Andreas, I am investigating on a broken job for the translation import of Horizon project [1]. The actual error message is : openstack_dashboard/locale/ko_KR/LC_MESSAGES/django.po:8273: a format specification for argument 'req' doesn't exist in 'msgstr[0]' And then I have found that this error was from a string in horizon - openstack_dashboard [2] error_message = ungettext_lazy( 'The requested instance cannot be launched as you only ' 'have %(avail)i of your quota available. ', 'The requested %(req)i instances cannot be launched as you ' 'only have %(avail)i of your quota available.', count) params = {'req': count, 'avail': available_count} In i18n translation infrastructure, only one of two (for singular and plural) strings should be selected, translated, saved, and finally imported back to Horizon project as [1]. However, the first string only used "%(avail)i" string variable, and the second string used both "%(req)i" and "%(avail)i" string variables. Since one Korean translator selected the first string, there will be no "%(req)i" in Korean po file, which generates such an error. So my suggestion is to use the same string variables for both two strings when we use ungettext_lazy function. Is it a bug from Horizon? Would it be other issues when we change like : from 'The requested instance cannot be launched as you only ' to 'The requested %(req)i instance cannot be launched as you only '? [1] http://logs.openstack.org/periodic/horizon-propose-translation-update/c038aa... [2] http://git.openstack.org/cgit/openstack/horizon/tree/openstack_dashboard/das... With many thanks, /Ian