[FIX] fixing report headers

addons/account/project/report/analytic_balance.py

addons/account/project/report/analytic_check.py

addons/account/project/report/analytic_journal.py

addons/account/project/report/cost_ledger.py

addons/account/project/report/inverted_analytic_balance.py

addons/account/project/report/quantity_cost_ledger.py

addons/account/report/account_aged_partner_balance.py

addons/account/report/account_balance.py

addons/account/report/account_balance_landscape.py

addons/account/report/account_balance_sheet.py

addons/account/report/account_general_ledger.py

addons/account/report/account_profit_loss.py

addons/account/report/account_tax_code.py

addons/account/report/compare_account_balance.py

addons/account/report/rml_parse.py

addons/account/report/tax_report.py

addons/account/report/voucher_print.py

addons/purchase_requisition/purchase_requisition.py

addons/purchase_requisition/purchase_requisition_view.xml

addons/sale/report/sale_order.py