Hi, I think for localisation troubleshooting it would be great to show, say as a balloon text when the mouse hovers over the localized string, the English original text (together with the key).
Sometimes an English word translates into multiple alternatives in the foreign language depending on the context. It is very easy to mistranslate those words when you work only with the JSON, then when you see the localised text only on the GUI then you just get confused: “what the heck this sentence wanted to mean here??”