Merge branch 'develop' into 'master'

migration/20.03/migrateCustomValues.php

sql/data_fr.sql

src/app/action/controllers/AcknowledgementReceiptTrait.php

src/app/attachment/controllers/AttachmentController.php

src/app/email/controllers/EmailController.php

src/app/resource/controllers/ResController.php

src/app/resource/controllers/ResourceControlController.php

src/core/lang/lang-en.php

src/core/lang/lang-fr.php

src/core/lang/lang-nl.php

...tachments/attachments-page/attachment-page.component.html

src/frontend/app/profile.component.html

src/frontend/app/profile.component.ts

src/frontend/app/viewer/document-viewer.component.ts