Add permissions to add, edit and cancel line items - Translation scope
This MR is related to #72 (closed): I add 3 new permissions:
- Edit Line Item: add line item
- Edit Line Item: edit line item
- Edit Line Item: cancel line item
Then I made some "fixes" on translations:
- add the scope in templates
- use
E::ts
instead ofts
when the keyword is closely related to this extension.