Hints for ocrfeeder in main

Warnings

• screenshot-save-error
  Unable to store screenshot for 'https://wiki.gnome.org/Apps/OCRFeeder?action=AttachFile&do=get&target=ocrfeeder.jpeg': Could not load source screenshot for storing: Unrecognized image file format
• screenshot-save-error
  Unable to store screenshot for 'https://wiki.gnome.org/Apps/OCRFeeder?action=AttachFile&do=get&target=ocrfeeder_unpaper.jpeg': Could not load source screenshot for storing: Unrecognized image file format
• screenshot-save-error
  Unable to store screenshot for 'https://wiki.gnome.org/Apps/OCRFeeder?action=AttachFile&do=get&target=ocrfeeder_spellchecker.png': Could not load source screenshot for storing: Unrecognized image file format