Add default font Ubuntu to css in the body of the page.

Signed-off-by: Alessandro Elias <ae11@c3sl.ufpr.br>

web/assets/less/main.less

@@ -11,7 +11,7 @@ html, body {
 }
 
 body {
-    font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
+    font-family: "Ubuntu","Helvetica Neue",Helvetica,Arial,sans-serif;
     font-size: 1.2em;
     line-height: 1.5;
     color: #333;
@@ -144,4 +144,4 @@ p.note {
      border-radius: 6px;
      padding: 14px 20px;
      mc-auto-number-format: '{b}Note: {/b}';
-}
\ No newline at end of file
+}