This was probably never a Thunderbird bug as it should have been raised
against whichever project is related to the seeding of packages for the
ISO images.
Checking against the manifests for all current Ubuntu releases I see
that "thunderbird-locale-fr" is present on all of the currently released
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: thunderbird (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/986885
Title: