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# ->loadData()
 -  loads messages from a XLIFF file
 -  returns false if it cannot load the messages from the file
# ->save()
 -  returns false if no message is saved
 -  returns true if some messages are saved
 -  saves new messages
 -  saves new messages
# ->update()
 -  returns true if the message has been updated
 -  updates a message translation
# ->delete()
 -  returns false if the message has not been deleted
 -  returns true if the message has been deleted
 -  deletes a message
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