feat(i18n): Simplified Chinese (zh-CN), search answers per locale, fr/de/es data fixes

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

public/exemplos/zh-CN/esp-dsp.c

@@ -16,7 +16,7 @@ void app_main(void)
         return;
     }
 
-    printf("Sinal de entrada:\n");
+    printf("Input signal:\n");
     for (int i = 0; i < N; i++) {
         printf("%f ", x[i]);
     }
@@ -33,5 +33,5 @@ void app_main(void)
     // 计算幅值（平方和的平方根）
     float magnitude = sqrtf(soma);
 
-    printf("Magnitude do vetor: %f\n", magnitude);
+    printf("Vector magnitude: %f\n", magnitude);
 }