In Magento 2.2 it is no longer impossible to enable inline translate in production mode. Sometimes the merchant still wants to update several translations, this is possible with the Mage2 Module Experius Missing Translations.
This module adds a command to collect missing translations in specified folder or the entire Magento 2 Root. These strings can the be easily translated through the Magento Admin Panel. Besides this main feature it also has the functionality to import Existing Translations to the Database so these can be edited by the merchant.