Update blog index.md

Author: smikitky

src/content/blog/index.md

@@ -36,7 +36,7 @@ Today, we're announcing our plans to create the React Foundation and a new techn
 
 <BlogCard title="React 19.2" date="October 1, 2025" url="/blog/2025/10/01/react-19-2">
 
-React 19.2 adds new features like Activity, React Performance Tracks, useEffectEvent, and more. In this post ...
+React 19.2 では Activity、パフォーマンストラック、useEffectEvent などの新機能が追加されます。
 
 </BlogCard>