TYPO3.Flow

This provides a way of detecting an appropriate
Locale to use for each request. Shipped with Flow
are two DetectionStrategies, Cookie and HttpAcceptHeader,
which will try to determine a Locale from these sources.
The Cookie's default name is assumed locale, but
can be set to a different one via Object.yaml.

If a DetectionStrategy can not reliably determine a
Locale, it returns NULL in order to abstain, and the
next Strategy in the configured chain is evaluated.
If eventually none matches, no concrete ``currentLocale``
will be set, hence falling back to the ``defaultLocale``.

Setting a Locale chain would look like::

1    TYPO3:
2      Flow:
3        i18n:
4          detectionChain: ['Cookie', 'AcceptLanguageHeader']

The array values can also be set to a full qualified class name
which must implement \TYPO3\Flow\I18n\Detection\DetectionStrategyInterface.

(from the commit message)