How to change dotnetnuke (dnn) default language

When dnn is installed, the default language for every website connection is English. You need to select Chinese in the language option to switch to Chinese. How can I set the default language to Chinese? The English Language Pack cannot be deleted as the default language. How can I remove it?

For dnn 4.6 and later versions, the setting method is as follows:
1. Set the default language to Chinese.
"
Website administrator-> website Settings "" advanced-> others-> default language"
Change the default language to what you want. At this time, you may find that the setting does not work. You can go to "website management-> language management" to enable "enable browser language ".
Detection for current portal ?" And "enable language parameter in URLs
Current portal ?" Set as deselected.

2,The English Language Pack cannot be deleted as the default language. How can I remove it?
After completing step 1, the English Language Pack is not the default language and can be disabled.