FEAT #8137 ConvertThumbnail process

apps/maarch_entreprise/actions/index_mlb.php

apps/maarch_entreprise/class/class_lists_Abstract.php

modules/attachments/attachments_content.php

modules/thumbnails/class/class_modules_tools.php

modules/thumbnails/doc_thumb.php

sql/develop.sql

sql/structure.sql

src/app/attachment/models/AttachmentModelAbstract.php

src/app/resource/controllers/ResController.php

src/app/resource/controllers/StoreController.php

...app/signatureBook/controllers/SignatureBookController.php

src/core/lang/lang-en.php

src/core/lang/lang-fr.php