(cherry picked from commit c15ce049)

Conflicts:
	app/classes/Framadate/Utils.php

(cherry picked from commit dcee9d4c)

(cherry picked from commit 6751a8a9)

Conflicts:
	adminstuds.php
	app/classes/Framadate/Utils.php
	creation_sondage.php

(cherry picked from commit e6d171a4)

Conflicts:
	app/classes/Framadate/Utils.php

(cherry picked from commit 9017676f)

Conflicts:
	choix_date.php

(cherry picked from commit 151f18bd)

Conflicts:
	.gitignore

Licence also exists in english. https://en.wiktionary.org/wiki/licence

(cherry picked from commit 0e91c257)

(cherry picked from commit 2c49a9f0)

Conflicts:
	adminstuds.php
	creation_sondage.php
	locale/de_DE/LC_MESSAGES/Studs.mo
	locale/de_DE/LC_MESSAGES/Studs.po
	studs.php

(cherry picked from commit 1a5846a1)

(cherry picked from commit 16da5370)

Conflicts:
	app/inc/constants.php.template
	app/inc/init.php

Adding the composer.lock in the repository is a best practice :
https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file

(cherry picked from commit 0468fb6d)

(cherry picked from commit b9e669a7)

Cherry-picked :
        e6d171a4

Conflicts:
	app/classes/Framadate/Utils.php