Remove unused photos.show.show_original_post translation

closes #7208

Remove unused photos.show.show_original_post translation
85888449 · Steffen van Bergerem · Benjamin Neff · 95566697 · 85888449
--- a/config/locales/diaspora/en.yml
+++ b/config/locales/diaspora/en.yml
@@ -898,8 +898,6 @@ en:
      invited_by: "You were invited by"

  photos:
-    show:
-      show_original_post: "Show original post"
    create:
      runtime_error: "Photo upload failed.  Are you sure that your seatbelt is fastened?"
      integrity_error: "Photo upload failed.  Are you sure that was an image?"