en to zh_CN translation catalogue (4 entries)

[ctx: The label of the line height toolbar button.]
en: Line height
zh_CN: 行距

[ctx: Dropdown option label for the custom line height, e.g., "Custom: 1.75".]
en: LINE_HEIGHT_CUSTOM_OPTION_LABEL
zh_CN: 自定义：%0

[ctx: Dropdown option label for the "Single" line height option.]
en: LINE_HEIGHT_SINGLE_OPTION_LABEL
zh_CN: 单倍行距

[ctx: Dropdown option label for the "Double" line height option.]
en: LINE_HEIGHT_DOUBLE_OPTION_LABEL
zh_CN: 双倍行距
