Package each exercise of lightbot, bat.string1 and sort lessons into their own repertory
Update po4a.conf to comply with theses changes
Merge pull request #11 from oster/master

Synchronisation
Correct a mistake in BuggleButtonPanel.java ( as notified in 044b9b70713aac56db855664dc2efaf14af39af2 by M. Quinson )
Update ChangeLog
Merge pull request #69 from g-humbert/master

Pull request n°4