[FIX] voluntary shares validation

Changelog

• [FIX][energy_communities] incorrect model render in the mail template causing that sometimes email can't be validated
• [IMP][energy_communities] validation for voluntary subscriptions can't be new type
• [IMP][energy_communities] Send only capital release mail when is mandatory share #TODO Remove it and implement a configuration
• [IMP][account_banking_mandate_cooperator] Add mandate approved field in view
• [IMP][account_banking_mandate_cooperator] added partner_id domain to mandate
• [I18N][energy_communities] updated pot and translations