[edit] Review the language file.

1.Your modification sees strange. It will become Can not select clock in pipeline. in English rather than Selected clock cannot be used in pipeline.

Agree, My mistake.

2.How about 用來敘述媒體內容的關鍵字，之間以逗號分開?

我理解的是，他想表達兩件事
comma separated keywords 
keywords describing the content

3.What does 參照給 mean?

A參照給B
A的設定會影響到B，A修改了B也跟著修改。