[13.0][IMP] project_purchase_link: FR Translation + improve button action

[acsonefho]

The action to display purchase invoices lines return every invoice lines, even related to customer invoices. But it should be only related to purchases (type is in_invoice)

[rousseldenis]

@acsonefho

[rafaelbn]

Hello @acsonefho , please could review comments from @rousseldenis ? Thanks!