How should the language attribute be translated?

[Praveen A <pravi.a@gmail.com>]

Hi,

# type: Attribute 'lang' of: <book>
#: en/release-notes.dbk:7
msgid "en"

I translated it to ml and it prints out a warning

"No localization exists for "ml" or "". Using default "en"."

Should I just keep it as en?

- Praveen
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