Added font/pre for external texts

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

@@ -2099,7 +2099,9 @@ public class HtmlHelper {
                                 ssb.setSpan(new StyleSpan(Typeface.ITALIC), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                                 break;
                             case "font":
-                                // Do nothing
+                                String face = element.attr("face");
+                                if (!TextUtils.isEmpty(face))
+                                    ssb.setSpan(new TypefaceSpan(face), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                                 break;
                             case "h1":
                             case "h2":
@@ -2193,6 +2195,9 @@ public class HtmlHelper {
                                 if (llevel > 0)
                                     ssb.setSpan(new LeadingMarginSpan.Standard(llevel * dp24), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                                 break;
+                            case "pre":
+                                ssb.setSpan(new TypefaceSpan("monospace"), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+                                break;
                             case "small":
                                 ssb.setSpan(new RelativeSizeSpan(FONT_SMALL), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                                 break;