Added dutch language file

I started from the latest en_EN.ini file.
I hope this is the correct way to do this.
Update nl_NL.ini

Added some values, like "Shift", "Draw Wireframe", etc...
Updated "Recent"

Updated "Recent"
Caps removed

Caps removed (https://github.com/hrydgard/ppsspp/pull/1424#issuecomment-16720668)
Added data delleted, sure to continue?

Whoops, thanks I missed that one.
Added "This save data will be deleted.\nAre you sure you want to continue?".
https://github.com/hrydgard/ppsspp/pull/1424#issuecomment-16720748
Merge pull request #1424 from Bennieboj/master

Added dutch language file