Update messages.po

Corrections in French
Merge pull request #20 from blaquans/patch-3

Update messages.po
version --> 1.3.0
added italian translation by @jenkin
updated non-minified d3.scale.js
replaced d3.scale.js with d3-light.js
italian translation needs update
IE compat for date parser
showing translation status in admin pages
updated translations
bugfix in rowDate, comments
providing default in get()
special date selector for time series, comments
moved custom time format func to raphael-chart
updated changelog
nicer time selector
allow navigating through time using left/right keys
fixed keyboard navigation
ignoring prevent_guest_chart if not set
checking for gridline exists