fix: update app UI and examples for Tier 1 languages

Update docstring, heading, and example languages to reflect the 22
production-ready language set. Replace removed languages (Japanese,
Swahili, Hindi) with Tier 1 alternatives (Spanish, German, Portuguese).

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

app.py

@@ -1,6 +1,6 @@
 """
 Translation interface using the MADLAD-400 3B model.
-Translates English text to evaluated languages from the MADLAD-400 paper.
+Translates English text to 22 production-ready languages from the MADLAD-400 paper.
 """
 
 import warnings
@@ -71,7 +71,7 @@ def _build_demo() -> gr.Blocks:
     with gr.Blocks(title="MADLAD-400 Translation") as demo:
         gr.Markdown(
             "# MADLAD-400 Translation\n"
-            "Translate English into 183 languages using Google's MADLAD-400 3B model. "
+            "Translate English into 22 production-ready languages using Google's MADLAD-400 3B model. "
             "[Paper](https://arxiv.org/pdf/2309.04662)"
         )
 
@@ -105,9 +105,9 @@ def _build_demo() -> gr.Blocks:
         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"],
+                ["The weather is beautiful.", "Spanish"],
+                ["Thank you very much.", "German"],
+                ["Where is the train station?", "Portuguese"],
             ],
             inputs=[input_text, target_language],
         )