models: `Clns::Grn` add field `doc_text`, fix #7
i18n: `grn.yml` add translation, related to #7
views: `Clns::Grn` CRUD updates regarding #7
views: `Clns::Grn` pdf template improve and fix #10
views: `Clns::DeliveryNote` show `doc_text` before freight table
update CHANGELOG
bump version v0.2.20
Merge branch 'feature/v0.2.20' into develop, issues #7, #10