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typo3/flow package contains basic functionality to access CLDR data, which is shipped with flow.
Flow ships a lowlevel API to access the data. The problem with that approach is, that this way often huge XML files are parsed which causes an huge impact on speed.
To fix that this package uses the caching mechanism shipped with flow and provides entities and value objects for langauges and soon also other cldr data like territories, currencies, etc.
to get more information about available commands. The important ones are described here:
./flow language:show --locale=de_DEWill output all language names in german
./flow language:showWill output all language names in english