Locale Support for JSDuck.

Hi! I want to use JSDuck in Japanese but some description was hard coded in English.. So I added some changes to convert hard coded characters to config value. 

I created a new directory `config` at project root and put locale.yml file. It defines mapping that hard coded characters and local characters. 

If you have a good idea to solve this problem, I want to hear your opinion.

Cheers :-D

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- Add Locale class
- Add config/locale.yml
- Update process/accessors.rb