Update translation files

Updated by "Update LINGUAS file" hook in Weblate.

Translation: Settings/System Plug (Extra)
Translate-URL: https://l10n.elementaryos.org/projects/settings/about-plug-extra/

Author: weblate

po/extra/LINGUAS

@@ -188,7 +188,6 @@ yo
 za
 zh
 zh_CN
-zh_HK
 zh_TW
 zu
 aa