Normalize deprecated 2-letter language code when necessary.

This is a follow up CL for I7d932e60311b80c05be8f02c9e803f18da0e0054,
which revealed that we could not use deprecated 2-letter code like "in"
to query subtype which has new language codes like "id".

This CL addresses the above issue by normalizing the language code
with Locale#Locale(String, String) before comparing one to another.

Change-Id: I26e3aa0333aa3c76c80a3c1c9090cc2b368c8e10