Just using AddType doesn't seem to give translated content for web browsers set for Portuguese (Brazil) or Chinese (Simplified) languages. Adding the "AddLanguage" directive with the lowercase-and-dash version of the language codes seems to do the job -- worked for me locally.
Basically, AddLanguage directive allows to lead a requested language-tag to a certain extension. So, if the web browser requests "pt-br" we can tell it to access pages with extension ".pt_BR".
Just using AddType doesn't seem to give translated content for web browsers set for Portuguese (Brazil) or Chinese (Simplified) languages. Adding the "AddLanguage" directive with the lowercase-and-dash version of the language codes seems to do the job -- worked for me locally.
About AddLanguage: https://httpd.apache.org/docs/2.4/pt-br/mod/mod_mime.html#addlanguage
This hopefully fixes mquinson/po4a#139