Set to true in order to store a Locale in the session based on
the current request's Accept-Language header (if
any) if none has currently been set. This attribute will create a session
if one does not already exist. The lang attribute is rendered with the
appropriate language code.
DEPRECATED:
Creating a session is undesirable for apps that don't support them. Use the lang
attribute to achieve the same functionality without creating a session.
[RT Expr]
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