Show deleted source language strings so they can be restored

When a key from the default locale file is deleted, either in Localazy or after upload of a differing string file with new source keys, then atm there is no way as an owner to find these deleted strings anywhere. Or at least I haven’t found that way. Either to be able to restore them (e.g. if accidentally deleted in File Management of Localazy) and also to review & approve that change.