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/mastodon.toml

@@ -5,6 +5,24 @@ category = "social"
 icon = "🐘"
 protocol = "rest-api"
 
+[i18n.zh]
+description = "Mastodon 适配器，在 Mastodon 实例上发布嘟文和阅读时间线"
+
+[i18n.zh-TW]
+description = "Mastodon 適配器，在 Mastodon 實例上發布嘟文和閱讀時間線"
+
+[i18n.ja]
+description = "Mastodonアダプター、Mastodonインスタンスでのトゥート投稿とタイムライン閲覧"
+
+[i18n.ko]
+description = "Mastodon 어댑터, Mastodon 인스턴스에서 글 게시 및 타임라인 읽기"
+
+[i18n.de]
+description = "Mastodon-Adapter zum Posten von Toots und Lesen von Timelines auf Mastodon-Instanzen"
+
+[i18n.es]
+description = "Adaptador de Mastodon para publicar toots y leer líneas de tiempo en instancias de Mastodon"
+
 [metadata]
 url = "https://joinmastodon.org"
 docs = "https://docs.joinmastodon.org/api/"