Add Explanation for entering the API key when adding an LLM (#2055)

### What problem does this PR solve?

Add Explanation for entering the API key when adding an LLM

### Type of change

- [x] Performance Improvement

---------

Co-authored-by: Zhedong Cen <cenzhedong2@126.com>

web/src/locales/en.ts

@@ -466,7 +466,8 @@ The above is the content you need to summarize.`,
       modelsToBeAdded: 'Models to be added',
       addTheModel: 'Add the model',
       apiKey: 'API-Key',
-      apiKeyMessage: 'Please input api key!',
+      apiKeyMessage:
+        'Please enter the API key (for locally deployed model,ignore this).',
       apiKeyTip:
         'The API key can be obtained by registering the corresponding LLM supplier.',
       showMoreModels: 'Show more models',