Fix bottom left reference to zh-Hans language

Forward port #10048

Author: DelazJ

docs_conf.yml

@@ -1,4 +1,4 @@
 
 version_list: testing, latest, 3.44, 3.40, 3.34, 3.28, 3.22, 3.16, 3.10, 3.4, 2.18
 # Fill this list with the languages we build for the release, space separated
-supported_languages: en # cs de es fr hu it ja ko lt nl pl pt_BR pt_PT ro ru sv zh_Hans
+supported_languages: en # cs de es fr hu it ja ko lt nl pl pt_BR pt_PT ro ru sv zh-Hans