small correction on french year (annees > ans)
Merge pull request #523 from baptistedeleplace/master

french : xx année(s) -> xx an(s)
Update readme.md
Fix Danish localizations (24 hour time, 'månede' -> 'måned')
Merge pull request #550 from st33n/master

Fix issues with danish localization
Update CONTRIBUTING.md
merging in develop