Thank you for your question.
Don't share the site credentials on the forum as this is public forum and anybody can misuse the credentials.
I checked your published wiki post
when i click page nothing happen
When you click on page tab nothing happens because by default it is active wiki tab.
Discussion there is a blank page
The discussion tab will only show if you enable comments on this specific wiki article. This utilizes the WordPress comments system to enable discussions so all those same rules apply here too.
You will find more information about the wiki tabs on the following page.
History is coming without wiki tabs
Yes history and some other tabs are coming without wiki tabs which is known issue in the current free Wiki plugin, it's not present in pro wiki plugin and it will be fixed in the next plugin release.
In the meanwhile to fix it you can just edit the free Wiki plugin file
In the above file move code from line number 697 to 700 on line number 702
Edit is going above the header
create new also same
Advanced going to the editor dashboard
I think these are theme specific issue as it's working fine on my test site using default WordPress twenty twelve theme.
Can you please just test it using default WordPress twenty twelve theme and without translating the theme?
I will find out why it's conflicting with the theme you are using.
Just want to make sure are you using the following theme?