fixing tiny english mistakes

je me faisais chier alors je me suis dit que
j'allais faire des trucs inutiles que seb kiff
adding tiny bits in the french locales/fixing punctuation

Oui vraiment, j'ai que ça à foutre.
translating in french the lonely and sad description placeholder
Protect the staging environment
Merge pull request #54 from mainelabs/protect-staging-env

Protect the staging environment
Hound review typo
Cleanup useless .gitkeep files
Merge pull request #55 from mainelabs/remove-useless-gitkeep

Cleanup useless .gitkeep files
Merge pull request #51 from Leimi/fix-tiny-i18n-stuff

Fix tiny i18n stuff
Hide messages and transform buttons on small vertical screens
Display arrows when possible
Merge application.js and app.js
Hide map when displaying a place on small devices
Remove autofocus : creates a weird display on mobile devices