Merge branch 'fix/20509/develop' into develop

lang/en.json

lang/fr.json

rest/index.php

sql/data_fr.sql

sql/structure.sql

src/app/group/controllers/GroupController.php

src/app/group/controllers/PrivilegeController.php

src/app/group/models/GroupPrivilegeModel.php

src/app/history/controllers/HistoryController.php

src/app/user/controllers/SignatureController.php

src/app/user/controllers/UserController.php

src/app/user/models/UserGroupModel.php

src/app/user/models/UserModel.php

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

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

...app/administration/group/modal/group-modal.component.html

...app/administration/group/modal/group-modal.component.scss

...d/app/administration/group/modal/group-modal.component.ts

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

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