Issue with translate function - translations of i18n string variable names

## 🐛 Bug Report

The translate tool sometimes translates the contents of i18n key variables e.g. `"text {{variable}} text"` becoming `translatedText {{translatedVariable}} translatedText`.

## To Reproduce

Input source JSON into the translate function, the input JSON needs to include variables such as:

```
{"key": "text {{variable}} text"}
```

## Expected behavior

output JSON does not translate {{variable}}, just the surrounding `text` strings.

## Actual behavior

Occasionally the variable gets translated. If the variable gets translated then the i18n string will not render properly.

## Workaround

I created a script to check deeply nested JSON string variables against the original locale source

https://github.com/bitshares/beet/blob/b205710efd26e2150adea036a58180384f27fe89/src/translations/fix_locale_variables_post_translation.js

## Your Environment

Firefox web browser, using https://translate.i18next.com