friend.png, error.png, achievement.png - Licensed under CC-BY-SA 3.0 by Magne Djupvik (notification_backgrounds.xcf), 
    based on  cup_gold.png licensed under CC-BY-SA 3+ from Open Game Art (art by onyum.com, comissionned by Bart Kelsey)
    glass_section.png licensed under CC-BY-SA 3.0 Unported and main_about.png licensed under Creative-Commons BY-SA 3, By yeKcim (Anthony Carré)

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