Error in deleting. Can not delete media files

  • Can not delete any Media file, or even remove Featured Image from Post.
    While deleting media it gives “Error in deleting.” page.
    While I am trying to delete featured image from post, there is an error in console — “Uncaught ReferenceError: setPostThumbnailL10n is not defined”.
    Really have no idea what could cause it, and where to dig. Could someone advice what could case such problems.

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