What is {gv-GB} in language setting?

English
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#1

In LibreOffice 6.0, one of the options at Tools>Language>For selection (or Page or All Text) is {gv-GB}. What is this?

#2

That’s for Manx, for more, see Languages · TryGhost/roon-i18n Wiki · GitHub

#3

Thank you.
It seems quite odd that Manx would appear by default. Has there been a population explosion there?

#4

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