Comment 5 for bug 1563005

After investigating the detail, this is caused by the same reason as for bug 1630507.

In the format of PO, theoretically we accept different substitution for a singular and plural forms. However, GNU gettext implementation does not allow this. The error reported in this bug is caused by GNU gettext implementation details.

We already changes the string to have the same substitution for all plural cases including a singular form as a fix of bug 1630507, so I believe this bug no longer exists.