Merge branch 'develop' into 'fix/20778/develop'

.gitlab-ci.yml

lang/en.json

lang/fr.json

phpunit.xml

src/app/email/controllers/EmailController.php

src/app/user/controllers/UserController.php

src/app/user/models/UserModel.php

src/core/controllers/AuthenticationController.php

src/core/models/DatabasePDO.php

src/core/models/PasswordModel.php

src/frontend/app/administration/group/group.component.html

src/frontend/app/administration/group/group.component.ts

...ontend/app/administration/group/list/users.component.html

test/unitTests/app/user/UserControllerTest.php