Localization language failed

[luojiandan_bi]

I followed the doc:

https://docs.microsoft.com/en-us/power-bi/developer/visuals/localization

add locale power bi language,like this:

add en-US and zh-CN sub folder in "stringResources" folder,and two "resources.resjson" file,which setting every displayName for locale language.

but when I setting the locale language to 'en-US',the setting not working:

what I miss?

thanks.