Revert "Capitalize month and day names for fr, fr-CA, fr-CH"

French days names and months shouldn't be capitalized. 
For reference (fr) : [Academie Francaise](http://www.academie-francaise.fr/la-langue-francaise/questions-de-langue#42_strong-em-jours-de-la-semaine-pluriel-et-majuscules-em-strong) or [Wikipedia](http://fr.wikipedia.org/wiki/Usage_des_majuscules_en_fran%C3%A7ais#Jours_de_la_semaine_et_mois_de_l.27ann.C3.A9e)

This reverts commit 327b840ae2dff282f94fcf31a2edf0e16d2c0ab8.