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# ->getCatalogueByDir()
 -  returns catalogues by directory
# ->getCatalogueList()
 -  returns all catalogues for the current culture
# ->getSource()
 -  returns the full path name to a specific variant
# ->isValidSource()
 -  returns false if the source is not valid
 -  returns true if the source is valid
# ->getLastModified()
 -  returns 0 if the source does not exist
 -  returns the last modified time of the source
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