When importing/exporting translation files, the "other" form isn't appearing or being populated.
The CLDR software standard contain 4 plural forms, while GNU Gettext supports three--the other form for floating point numbers is not included.
(If your gettext file contains the 4th plural form, it is because you have overridden the default gettext rules, since gettext allows custom languages with custom rules.)
In order to better support GNU gettext files, OneSky will only export 3 plural forms for these languages. We currently do not have plans to support custom languages, but it is something our product team will consider in the future.