Small improvements

app/src/extra/java/eu/faircode/email/VirusTotal.java

@@ -70,6 +70,7 @@ public class VirusTotal {
         connection.setConnectTimeout(VT_TIMEOUT * 1000);
         ConnectionHelper.setUserAgent(context, connection);
         connection.setRequestProperty("x-apikey", apikey);
+        connection.setRequestProperty("Accept", "application/json");
         connection.connect();
 
         try {

app/src/main/res/layout/dialog_virus_total.xml

@@ -70,7 +70,7 @@
             android:layout_height="wrap_content"
             android:layout_marginTop="12dp"
             android:text="@string/title_vt_unknown"
-            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+            android:textAppearance="@style/TextAppearance.AppCompat.Small"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tvLabel" />
     </androidx.constraintlayout.widget.ConstraintLayout>