optimize: improved English prompt (#2)

* Improved prompt

- Specify dimensions
- List changes and reasons.

* Update main.js

---------

Co-authored-by: yetone <[email protected]>

Author: reycn

src/main.js

@@ -12,7 +12,7 @@ function translate(query, completion) {
         "Content-Type": "application/json",
         Authorization: `Bearer ${api_key}`,
     };
-    let prompt = "please polish this sentence";
+    let prompt = "Revise the following sentence to make it more clear, concise, and coherent. Please note that you need to list the changes and briefly explain why.";
     switch (query.detectFrom) {
         case "zh-Hant":
         case "zh-Hans":