Add credits for icons.

[sebsauvage]

Because they are missing.
http://www.fatcow.com/free-icons

[respencer]

Easier said than done. I searched, but could only track down a few.

50pc_transparent.png - Source unknown
calendar.png - https://www.fatcow.com/free-icons (Creative Commons Attribution 3.0 License)
delete_icon.png - Source unknown
edit_icon.png - Source unknown
favicon.ico - Source code?
feed-icon-14x14.png - http://www.feedicons.com/ (Mozilla - Free use)
floral_left.png - Source unknown
floral_right.png - Source unknown
logo.png - Source code?
Paper_texture_v5_by_bashcorpo_w1000.jpg - http://www.istockphoto.com/stock-photo-8290578-dirty-grunge-paper-texture.php (Standard or extended license?)
private_16x16_active.png - Source unknown
private_16x16.png - Source unknown
private.png - Source unknown
qrcode.png - Source unknown
squiggle2.png - Source unknown
squiggle_closing.png - Source unknown
squiggle.png - Source unknown
tag_blue.png - Source unknown

[Charpy]

I have a few more :

50pc_transparent.png - Source unknown
calendar.png - https://www.fatcow.com/free-icons (Creative Commons Attribution 3.0 License)
delete_icon.png - http://www.iconfinder.com/icondetails/37519/16/can_delete_trash_icon ( Free for commercial use )
edit_icon.png - http://www.iconfinder.com/icondetails/14042/16/edit_pen_pencil_text_write_icon (Creative Commons (Attribution 3.0 Unported))
favicon.ico - Idleman http://blog.idleman.fr/
feed-icon-14x14.png - http://www.feedicons.com/ (Mozilla - Free use)
floral_left.png - Source unknown
floral_right.png - Source unknown
logo.png - Idleman http://blog.idleman.fr/
Paper_texture_v5_by_bashcorpo_w1000.jpg - http://www.istockphoto.com/stock-photo-8290578-dirty-grunge-paper-texture.php (Standard or extended license?)
private_16x16_active.png - http://www.iconfinder.com/icondetails/111039/16/key_icon (Creative Commons (Attribution-Share Alike 3.0 Unported))
private_16x16.png - idem?
private.png - idem?
qrcode.png - Source unknown
squiggle2.png - Source unknown
squiggle_closing.png - Source unknown
squiggle.png - Source unknown
tag_blue.png - http://www.iconfinder.com/icondetails/5815/16/blue_tag_icon (Creative Commons (Attribution 2.5 Generic))