Set country code as content description

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -5739,6 +5739,10 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                             else
                                 ivFlag.setImageResource(resid);
 
+                            ivFlag.setContentDescription(data.second.country);
+                            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
+                                ivFlag.setTooltipText(data.second.country);
+
                             tvHost.setText(data.first);
                             tvOwner.setText(TextUtils.isEmpty(data.second.name) ? "?" : data.second.name);
                             new Handler().post(new Runnable() {