Merge branch 'redmine-issues/15859-new' into '1.2'

public/config.js

src/App.vue

src/api/loginAPI.js

src/api/organisationsAPI.js

src/api/usergroupsAPI.js

src/assets/locales/en.json

src/assets/locales/fr.json

src/components/ConfirmationModal.vue

src/components/OrganisationCreation.vue

src/components/OrganisationSelector.vue

src/components/SearchUsergroups.vue

src/services/error-service.js

src/store/modules/modal.store.js

src/store/modules/organisations.store.js

src/store/modules/sign-up.store.js

src/store/modules/usergroups.store.js

src/utils.js

src/views/ForgottenPassword.vue

src/views/OrganisationSignUp.vue

src/views/ReinitPassword.vue