Add vernacular names of languages

config.toml

@@ -1,5 +1,6 @@
 [defaults]
 # name has no default, it is mandatory.
+# name is in the format: EnglishName | VernacularName
 in_prod = true
 html_only = false
 sphinxopts = [
@@ -12,30 +13,30 @@ sphinxopts = [
 name = "English"
 
 [languages.es]
-name = "Spanish"
+name = "Spanish | español"
 sphinxopts = [
     '-D latex_engine=xelatex',
     '-D latex_elements.inputenc=',
     '-D latex_elements.fontenc=\\usepackage{fontspec}',
 ]
 
 [languages.fr]
-name = "French"
+name = "French | français"
 sphinxopts = [
     '-D latex_engine=xelatex',
     '-D latex_elements.inputenc=',
     '-D latex_elements.fontenc=\\usepackage{fontspec}',
 ]
 
 [languages.id]
-name = "Indonesian"
+name = "Indonesian | Indonesia"
 in_prod = false
 
 [languages.it]
-name = "Italian"
+name = "Italian | italiano"
 
 [languages.ja]
-name = "Japanese"
+name = "Japanese | 日本語"
 sphinxopts = [
     '-D latex_engine=lualatex',
     '-D latex_elements.inputenc=',
@@ -58,7 +59,7 @@ sphinxopts = [
 ]
 
 [languages.ko]
-name = "Korean"
+name = "Korean | 한국어"
 sphinxopts = [
     '-D latex_engine=xelatex',
     '-D latex_elements.inputenc=',
@@ -67,29 +68,29 @@ sphinxopts = [
 ]
 
 [languages.pl]
-name = "Polish"
+name = "Polish | polski"
 
 [languages.pt_BR]
-name = "Brazilian Portuguese"
+name = "Brazilian Portuguese | Português brasileiro"
 
 [languages.tr]
-name = "Turkish"
+name = "Turkish | Türkçe"
 
 [languages.uk]
-name = "Ukrainian"
+name = "Ukrainian | українська"
 in_prod = false
 html_only = true
 
 [languages.zh_CN]
-name = "Simplified Chinese"
+name = "Simplified Chinese | 简化字"
 sphinxopts = [
     '-D latex_engine=xelatex',
     '-D latex_elements.inputenc=',
     '-D latex_elements.fontenc=\\usepackage{xeCJK}',
 ]
 
 [languages.zh_TW]
-name = "Traditional Chinese"
+name = "Traditional Chinese | 簡化字"
 sphinxopts = [
     '-D latex_engine=xelatex',
     '-D latex_elements.inputenc=',