feat: replace gr.Interface with gr.Blocks for improved UI

Two-column layout, Soft theme, searchable dropdown, copy button,
and example translations for a friendlier experience.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.py

@@ -68,17 +68,49 @@ def translate(text: str, target_language_name: str) -> str:
 def main() -> None:
     _, language_names = _build_language_mappings()
 
-    demo = gr.Interface(
-        fn=translate,
-        inputs=[
-            gr.Textbox(label="Text", placeholder="Enter text here"),
-            gr.Dropdown(choices=language_names, value="French", label="Target language"),
-        ],
-        outputs=gr.Textbox(label="Translation"),
-        title="MADLAD-400 Translation",
-        description="Translation from English to evaluated languages (Table 14, Section A.9) from the "
-        "[MADLAD-400 paper](https://arxiv.org/pdf/2309.04662) by Google DeepMind and Google Research.",
-    )
+    with gr.Blocks(theme=gr.themes.Soft(), title="MADLAD-400 Translation") as demo:
+        gr.Markdown(
+            "# MADLAD-400 Translation\n"
+            "Translate English into 183 languages using Google's MADLAD-400 3B model. "
+            "[Paper](https://arxiv.org/pdf/2309.04662)"
+        )
+
+        target_language = gr.Dropdown(
+            choices=language_names,
+            value="French",
+            label="Target language",
+        )
+
+        with gr.Row():
+            input_text = gr.Textbox(
+                label="English",
+                placeholder="Enter English text here",
+                lines=4,
+            )
+            output_text = gr.Textbox(
+                label="Translation",
+                lines=4,
+                buttons=["copy"],
+                interactive=False,
+            )
+
+        translate_btn = gr.Button("Translate", variant="primary")
+
+        translate_btn.click(
+            fn=translate,
+            inputs=[input_text, target_language],
+            outputs=output_text,
+        )
+
+        gr.Examples(
+            examples=[
+                ["Hello, how are you today?", "French"],
+                ["The weather is beautiful.", "Japanese"],
+                ["Thank you very much.", "Swahili"],
+                ["Where is the train station?", "Hindi"],
+            ],
+            inputs=[input_text, target_language],
+        )
 
     demo.launch()