[IMP] Supplier --> Vendor. American English

addons/account/models/account.py

addons/account/models/account_invoice.py

addons/account/models/account_move.py

addons/account/models/account_payment.py

addons/account/models/chart_template.py

addons/account/models/partner.py

addons/account/models/product.py

addons/account/models/res_config.py

addons/account/report/account_invoice_report.py

addons/account/tests/test_account_supplier_invoice.py

addons/account/tests/test_reconciliation.py

addons/account_check_writing/tests/test_check_writing.py

addons/hr_equipment/models/hr_equipment.py

addons/inter_company_rules/models/purchase_order.py

addons/inter_company_rules/models/res_company.py

addons/inter_company_rules/models/res_config.py

addons/lunch/models/lunch.py

addons/purchase/report/purchase_report.py

addons/purchase/wizard/purchase_line_invoice.py

...rchase_requisition/wizard/purchase_requisition_partner.py