FEAT #14537 TIME 2:45 registered mails admin fixes

migration/20.10/2010.sql

sql/structure.sql

src/app/registeredMail/controllers/IssuingSiteController.php

...teredMail/controllers/RegisteredNumberRangeController.php

.../registered-mail/issuing-site/issuing-site.component.html

...on/registered-mail/issuing-site/issuing-site.component.ts

...nistration/registered-mail/registered-mail.component.html

...ministration/registered-mail/registered-mail.component.ts

...d/app/indexation/indexing-form/indexing-form.component.ts

src/lang/lang-fr.json

...nitTests/app/registeredMail/IssuingSiteControllerTest.php

...pp/registeredMail/RegisteredNumberRangeControllerTest.php