Support customize lang

Author: Folyd

theme/components/Landingpage/features.yaml

@@ -533,6 +533,7 @@ language:
           let p = Person { name, age };
           print(p.name, p.age); // expect: Alice 30
         filename: class_literal.ai
+        lang: javascript
       - code: |
           class User {
               @string(min_len=3, max=20)
@@ -571,6 +572,7 @@ language:
           //      msg: Field required
           // }
         filename: class_field_validation.ai
+        lang: javascript
 
 
 std-library:

theme/components/feature-demo/index.tsx

@@ -8,6 +8,7 @@ interface CodeDemoItem {
     code?: string;
     img?: string;
     filename?: string;
+    lang?: string;
 }
 
 interface FeatureDemoProps {
@@ -42,6 +43,7 @@ const FeatureDemo: FC<FeatureDemoProps> = ({
                                 <CodeDemo
                                     code={demo.code}
                                     img={demo.img}
+                                    language={demo.lang}
                                 />
                             </Tab>
                         ))}

theme/components/feature-group/index.tsx

@@ -10,6 +10,7 @@ interface Feature {
     filename?: string;
   }>;
   isReversed?: boolean;
+  lang?: string;
 }
 
 interface FeatureGroupProps {