feat: add i18n descriptions to all hands and channels (#22)

Add [i18n.zh], [i18n.zh-TW], [i18n.ja], [i18n.ko], [i18n.de], [i18n.es]
sections with translated descriptions to:
- 15 Hand TOML files (hands/*/HAND.toml)
- 44 Channel TOML files (channels/*.toml)

This enables the website to display localized Hand and Channel descriptions
based on the user's selected language.

channels/matrix.toml

@@ -5,6 +5,24 @@ category = "messaging"
 icon = "🟩"
 protocol = "matrix"
 
+[i18n.zh]
+description = "Matrix 适配器，通过 Matrix 客户端-服务器 API 进行去中心化通信"
+
+[i18n.zh-TW]
+description = "Matrix 適配器，透過 Matrix 用戶端-伺服器 API 進行去中心化通訊"
+
+[i18n.ja]
+description = "Matrixアダプター、Matrixクライアント-サーバーAPIによる分散型メッセージング"
+
+[i18n.ko]
+description = "Matrix 어댑터, Matrix 클라이언트-서버 API를 통한 탈중앙화 메시지 송수신"
+
+[i18n.de]
+description = "Matrix-Adapter für dezentrales Messaging über die Matrix Client-Server-API"
+
+[i18n.es]
+description = "Adaptador de Matrix para mensajería descentralizada a través de la API cliente-servidor de Matrix"
+
 [metadata]
 url = "https://matrix.org"
 docs = "https://spec.matrix.org/latest/client-server-api/"