[MERGE] forward port of branch 8.0 up to bde083a5

addons/account/account_invoice.py

addons/account/i18n/ca.po

addons/account/i18n/fa.po

addons/account/i18n/sk.po

addons/account/i18n/sr@latin.po

addons/account/report/account_aged_partner_balance.py

addons/account_analytic_analysis/i18n/sr@latin.po

addons/account_analytic_plans/i18n/ca.po

addons/account_anglo_saxon/i18n/ca.po

addons/account_asset/i18n/ca.po

addons/account_asset/i18n/fr.po

addons/account_asset/i18n/sr@latin.po

addons/account_budget/i18n/ca.po

addons/account_budget/i18n/cs.po

addons/account_check_writing/i18n/cs.po

addons/account_voucher/i18n/ka.po

addons/account_voucher/i18n/sr@latin.po

addons/analytic/i18n/fa.po

addons/analytic/i18n/ka.po

addons/analytic_contract_hr_expense/i18n/ru.po