Support for displaying English description of problems in leetcode-cn

[twchn]

🚀 Feature Proposal

Thanks for your selfless contribution at first.
I wonder to know, is it possible to add a configuration to switch the language of leetcode-cn's problems, as it provides two languages:

Motivation

I want to use leetcode-cn in English problem description.

[hello2mao]

+1

[Lam9090]

+1

[abowloflrf]

and the problem title

[zxc2012]

+1

[jdneo]

Fixed by #690