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/mumble.toml

@@ -5,6 +5,24 @@ category = "iot"
 icon = "🎙️"
 protocol = "websocket"
 
+[i18n.zh]
+description = "Mumble 适配器，在 Mumble 语音通信服务器中发送文字消息"
+
+[i18n.zh-TW]
+description = "Mumble 適配器，在 Mumble 語音通訊伺服器中發送文字訊息"
+
+[i18n.ja]
+description = "Mumbleアダプター、Mumble音声通信サーバーでのテキストメッセージング"
+
+[i18n.ko]
+description = "Mumble 어댑터, Mumble 음성 통신 서버에서 텍스트 메시지 전송"
+
+[i18n.de]
+description = "Mumble-Adapter für Textnachrichten in Mumble-Sprachkommunikationsservern"
+
+[i18n.es]
+description = "Adaptador de Mumble para mensajería de texto en servidores de comunicación por voz Mumble"
+
 [metadata]
 url = "https://www.mumble.info"
 docs = "https://wiki.mumble.info/wiki/Protocol"