en to zh_CN translation catalogue (2 entries)

[ctx: Keystroke description for assistive technologies: keystroke for inserting a soft break.]
en: Insert a soft break (a <code>&lt;br&gt;</code> element)
zh_CN: 插入软换行（一个<code>&lt;br&gt;</code> 元素）

[ctx: Keystroke description for assistive technologies: keystroke for inserting a hard break.]
en: Insert a hard break (a new paragraph)
zh_CN: 插入硬换行（新段落）
