pfSense

Same for me.
https://github.com/pfsense/pfsense/tree/master/src/usr/local/share/locale
has lots of language folders

But on my VM there is only a subset:

[2.4.0-BETA][root@pfSense.localdomain]/root: find /usr/local/share -name pfSense.po | sort
/usr/local/share/locale/cs/LC_MESSAGES/pfSense.po
/usr/local/share/locale/de_DE/LC_MESSAGES/pfSense.po
/usr/local/share/locale/el/LC_MESSAGES/pfSense.po
/usr/local/share/locale/en_US/LC_MESSAGES/pfSense.po
/usr/local/share/locale/es_AR/LC_MESSAGES/pfSense.po
/usr/local/share/locale/fi/LC_MESSAGES/pfSense.po
/usr/local/share/locale/ja/LC_MESSAGES/pfSense.po
/usr/local/share/locale/ne/LC_MESSAGES/pfSense.po
/usr/local/share/locale/pl/LC_MESSAGES/pfSense.po
/usr/local/share/locale/pt_BR/LC_MESSAGES/pfSense.po
/usr/local/share/locale/ro/LC_MESSAGES/pfSense.po
/usr/local/share/locale/sl/LC_MESSAGES/pfSense.po
/usr/local/share/locale/sr_Latn/LC_MESSAGES/pfSense.po
/usr/local/share/locale/tr/LC_MESSAGES/pfSense.po
/usr/local/share/locale/zh_CN/LC_MESSAGES/pfSense.po
/usr/local/share/locale/zh_Hans_CN/LC_MESSAGES/pfSense.po
/usr/local/share/locale/zh_TW/LC_MESSAGES/pfSense.po


So I guess there is a script somewhere that chooses what of these to put in an upgrade package. Or maybe these are just the ones that were there when I last did a full install?

And with a full install from the latest snapshot pfSense-CE-2.4.0-BETA-amd64-20170503-1659 there is the same list of locale folders as above.

Should be fixed by https://github.com/pfsense/pfsense/commit/b079a611c0b751012e1ac16db8eb43f21021df88
Needs testing after the next snapshot build is done.

Fixed - all languages in the drop-down now work,
2.4.0-BETA (amd64)
built on Tue May 09 13:43:38 CDT 2017
FreeBSD 11.0-RELEASE-p8