Button to only show entries with missing translations

[mrkoenigstein]

It would be nice if the Editor has a button to only show entries where translation are missing.
With big files this could be useful instead of going through everything to find missing translations.

[DionJChapman]

Thanks for that, i will see if i can get it done by the weekend.

[zolakt]

This would be great to have. Especially if you could add the ability to export only visible items to a new json file.
That way you could easily just export all the new/missing stuff and send it out to translators.