"Add Translation" creates empty string translations

[jaunusa]

Hi, thank you very much for this plugin, very useful.

When creating a new translation entry with "Add Translation" and not filling all translation fields, empty strings are set in JSON translation files for missing translations.

I'm not sure how other i18n implementations handle empty strings, but for vuejs-i18n this breaks translation fallbacks to default languages. What is the purpose of setting empty strings in this case?