language block returns “中文(简体)” when using the "にほんご" language

[cyx2015s]

Expected Behavior

it returns "にほんご"

Actual Behavior

it returns “中文(简体)” (My computer is Chinese so I'm not sure what will it return on other languages' computer.)
Also, the language in the drop down menu is also Chinese.

Steps to Reproduce

1.change the language to "にほんご"
2. use the google translate extension and click "げんご"

Operating System and Browser

Win 8, Google Chrome 68

[cyx2015s]

Some other languages have the same behavior:Azeri, Espanol Latinoamericano, Maori, Portugues Brasileiro, 繁体中文
Languages that the "language" block returns a short code:the first language, Norsk bokmal, Norsk nynorsk,

[apple502j]

In Japanese computer it returned "日本語"
also in Traditional

I think "custom languages" are buggy.

[thisandagain]

Tracking in scratchfoundation/scratch-vm#1561