Hi,

As title described. I think this feature will be helpful when:

• managing projects programmatically
• integrating doccano with other jobs/services.

Here are my thoughts:

UI:

DB Models:
add one more t

Each item in the list should be written in the same language as what it's represent
Ex. :
The French choice should be Français
The Portuguese should be Português
The Chinese should be 中文
The Dutch should be Holländisch
(The traduction come from google traduction and should be double check)

![image](https://user-images.githubusercontent.com/74309042/105092026-b4229600-5a6e-11eb-9e6a-394b0