Add 24 hour format

[ghost]

Hi, I dislike am/pm time formatting. it's very confusing looking at 12 am and 12 pm (or 11am and 11pm) of places in different countries, maybe different days, all on the same screen. vs 00h00 and 12h00 / 11h00 and 23h00 would be much clearer for me, and I think a lot of people. 24hour clock format is extremely popular.

[CFPrulez]

@lope In my fork you'll find a fix for that: 12-hours/24-hours time formatting is now done depending on the system settings.

[rahulaga]

Awesome @CFPrulez