add french translation
Update strings.xml

Bonjour ;-) 
Where do I find the original english text? So I could probably make a better translation. It's the first time I collaborate to git. I apologize.
Merge pull request #12 from gityeti/patch-1

Corrected strings.xml
Merge remote-tracking branch 'origin/french_translation' into development
fix nullpointer exception (#9) and improve sql
add new buttons "save" and "delete" to actionbar. remove old ugly save and delete buttons
fix bug with tailing slash (#8)