Hints for gajim in main

Warnings

• screenshot-save-error
  Unable to store screenshot for 'https://gajim.org/imgs/gajim_single_window_mode.png': Can not store source screenshot: Failed to load image data: Unrecognized image file format
• screenshot-save-error
  Unable to store screenshot for 'https://gajim.org/imgs/gajim_tabbed_chat.png': Can not store source screenshot: Failed to load image data: Unrecognized image file format
• screenshot-save-error
  Unable to store screenshot for 'https://gajim.org/imgs/groupchat_window.png': Can not store source screenshot: Failed to load image data: Unrecognized image file format
• screenshot-save-error
  Unable to store screenshot for 'https://gajim.org/imgs/history_window.png': Can not store source screenshot: Failed to load image data: Unrecognized image file format
• screenshot-save-error
  Unable to store screenshot for 'https://gajim.org/imgs/gajim_plugins.png': Can not store source screenshot: Failed to load image data: Unrecognized image file format
• gettext-data-not-found
  Unable to find any translation data for specified Gettext domain 'gajim'.
• no-translation-statistics
  We could not extract any translation statitics, althout metadata hints were given that the data exists. Please check the <translation/> MetaInfo tag for spelling mistakes. It also makes sense to ensure all locale files are placed in the right directories (e.g. gettext .mo files in /usr/share/locale/*/LC_MESSAGES/