[Audacity-translation] Simplified Chinese translations

[min z. <zm...@gm...>]

hi,
I updated both Audacity and Audacity_website (incompletely)
I mitght don't have time to finish Audacity_website, but I translated
everything I thought was important (only left some FAQs and Realease notes).

And I find some items in Audacity 2.0.5 is still English, such as 'Click
Track' in 'Generate' menu.

And there's a Effect named Reverb, is there any manual of that, I find
diffcult to translate it (I have to guess based on their functions)