[I18N] Update translation terms from Transifex

addons/account/i18n/bg.po

addons/account/i18n/cs.po

addons/account/i18n/sk.po

addons/account/i18n/th.po

addons/account/i18n/tr.po

addons/account/i18n/uk.po

addons/account/i18n/zh_TW.po

addons/account_cash_basis_base_account/i18n/bg.po

addons/account_voucher/i18n/th.po

addons/analytic/i18n/cs.po

addons/auth_signup/i18n/it.po

addons/barcodes/i18n/cs.po

addons/base_setup/i18n/bg.po

addons/base_setup/i18n/hu.po

addons/base_vat/i18n/bg.po

addons/crm/i18n/cs.po

addons/crm/i18n/sl.po

addons/crm/i18n/zh_TW.po

addons/delivery/i18n/fi.po

addons/fetchmail/i18n/bg.po