translation-ja: more language config

wtsnjp · wtsnjp · commit d930238715c8 · 2025-03-22T14:03:57.000+09:00
diff --git a/_data/languages.yml b/_data/languages.yml
@@ -23,6 +23,10 @@
   label-regional: Français
   label-english: French
 
+- language-code: ja
+  label-regional: 日本語
+  label-english: Japanese
+
 - language-code: mr
   label-regional: मराठी
   label-english: Marathi
