[test5, test6] Created tests for Preview (SP, DP)
[1.0.W] Added about box (SP, DP)
[0.9.W][Refactor] <Navigation> (SP, DP)
[1.0.W] <Added about box> (SP, DP) 
[test6] <Testcase for preview added> (SP, DP) 
[0.9.W][Refactor] <Navigation> (SP, DP)