In the live site, we can add i18n_viz=1to the URL and have it show translation keys, e.g. https://fallingfruit.org/locations/new?c=forager%2Cfreegan&locale=en&location_id=1989825&i18n_viz=1 , with a click leading to a translation key page in Phrase (although with broken link). Let's do something similar - since the site is in beta, we can just have a checkbox to enable it: "show translation keys (for translators)".

For implementation simplicity, we can also add it as a language setting, "Translation keys (for translators)", and then a translator can just have two windows open at once.

Try to create a convenient experience for volunteers.