Big Data Discovery is configured with a list of available locales. This list is used to populate the list for configuring the default locale, user default locale, and the available locales displayed for the Change locale option.
You can add a the setting to portal-ext.properties to constrain the list.
There is an implicit list of the locals that Studio supports:
locales=en_US, en_UK, es_ES, ja_JP, ko_KR, pt_BR, zh_CN
To constrain this list: