CLDR v39 has no locales for Abkhazian, so the locale_index[] entry for
it actually indexes the last entry before the next language up the
enum. This has m_language_id less than Abkhazian.
Change-Id: If8b88f30476a981b3ee00ff8760a46ede0b7aab7
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>