Fix: Add prompt text to the form in the MCP module (#9222)

### What problem does this PR solve?

Fix: Add prompt text to the form in the MCP module #3221

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/locales/en.ts

@@ -39,6 +39,13 @@ export default {
       nextPage: 'Next',
       add: 'Add',
       promptPlaceholder: `Please input or use / to quickly insert variables.`,
+      mcp: {
+        namePlaceholder: 'My MCP Server',
+        nameRequired:
+          'It must be 1–64 characters long and can only contain letters, numbers, hyphens, and underscores.',
+        urlPlaceholder: 'https://api.example.com/v1/mcp',
+        tokenPlaceholder: 'e.g. eyJhbGciOiJIUzI1Ni...',
+      },
     },
     login: {
       login: 'Sign in',