Show ADSL order-id in contract view and update translations

CHANGELOG:

### Added
- [#691](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/691) Show ADSL order-id in contract view and update its translation

Related card: https://trello.com/c/OE8HLKpC/1075-canvis-en-camps-de-contractes-adsl

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