Adaptation setlocale en fonction de l'environnement (Windows)
Add environment variable to be able to switch between languages using Windows
UTF8 encode on Removal date for French chars on Months
correction warning pour acces $config[use_smtp] depuis adminstuds.php
reuse condition from choix_autre.php for Step 1 validation
remove warning "unknown index horaire0" one first access to choix_date.php
UTF8_encode(removal date) for date poll
several warning displayed : "A non well formed numeric value encountered in adminstuds.php"
remove all displayed warning by splitting day and hour in $current variable
several warning displayed : A non well formed numeric value encountered in "studs.php"
remove all displayed warning by splitting day and hour in $current variable
warning correction :
Warning: max(): Array must contain at least one element in "studs.php" on line 615
Merge branch 'master' into 'master'

adaptation Windows + Correction bugs

- Adaptations du code pour fonctionner sur Windows (bascule entre langages notamment qui ne fonctionnait pas chez moi)
- corrections de petits bugs (affichage de warning, encodage UTF-8)

See merge request !14