Language List in gnome-control-center

[A S Alam]

hi
gnome-control-center has limited set of language in Region and
Language -> Language
( British English, Chinese (simplified), English, Spanish)

Developer mention [1]:
"It shows a small selection of possible languages. You'll get more languages by
pressing the '+' button. The languages were chosen by Westerners as popular
choices, they cover parts of Western Europe, North America, South America, and
very large chunks of Africa."

anybody has suggestion for it "how language should be chosen"?

-- 
A S Alam
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[1] https://bugzilla.gnome.org/show_bug.cgi?id=671530