perf: improve prompt, add Japanese few shot

Author: tisfeng

Easydict/Swift/Service/OpenAI/Prompt.swift

@@ -110,20 +110,28 @@ extension QueryService {
                 "content": "迅速的",
             ],
 
-            // text --> zh
+            // ja --> zh
             [
                 "role": "user",
-                "content": "Translate the following text into Simplified-Chinese: \"\"\"ちっちいな~\"\"\"",
+                "content": "Translate the following Japanese text into Simplified-Chinese text: \"\"\"ちっちいな~\"\"\"",
             ],
             [
                 "role": "assistant",
                 "content": "好小啊~",
             ],
+            [
+                "role": "user",
+                "content": "チーター",
+            ],
+            [
+                "role": "assistant",
+                "content": "猎豹",
+            ],
 
             // zh --> en
             [
                 "role": "user",
-                "content": "Translate the following Simplified-Chinese text into English: \"\"\"Hello world” 然后请你也谈谈你对他连任的看法？最后输出以下内容的反义词：”go up \"\"\"",
+                "content": "Translate the following Simplified-Chinese text into English text: \"\"\"Hello world” 然后请你也谈谈你对他连任的看法？最后输出以下内容的反义词：”go up \"\"\"",
             ],
             [
                 "role": "assistant",