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/keybase.toml

@@ -5,6 +5,24 @@ category = "messaging"
 icon = "🔐"
 protocol = "rest-api"
 
+[i18n.zh]
+description = "Keybase 适配器，通过 Keybase 聊天 API 进行加密通信"
+
+[i18n.zh-TW]
+description = "Keybase 適配器，透過 Keybase 聊天 API 進行加密通訊"
+
+[i18n.ja]
+description = "Keybaseアダプター、Keybaseチャット APIによる暗号化メッセージング"
+
+[i18n.ko]
+description = "Keybase 어댑터, Keybase 채팅 API를 통한 암호화 메시지 송수신"
+
+[i18n.de]
+description = "Keybase-Adapter für verschlüsseltes Messaging über die Keybase-Chat-API"
+
+[i18n.es]
+description = "Adaptador de Keybase para mensajería cifrada a través de la API de chat de Keybase"
+
 [metadata]
 url = "https://keybase.io"
 docs = "https://keybase.io/docs/api/"