en to zh_HK translation catalogue (4 entries)

note: (itstool) path: sect1/title
en: Introduction
zh_HK: 導覽

note: (itstool) path: figure/title
en: Character Palette
zh_HK: 字符選擇盤

note: (itstool) path: figure/title
en: Character Palette Preferences
zh_HK: 選字盤偏好設定

note: (itstool) path: para/ulink
en: link
zh_HK: 連結
