update font.conf

fonts.conf

@@ -2,14 +2,19 @@
 <!DOCTYPE fontconfig SYSTEM "fonts.dtd">
 <fontconfig>
 
-  <alias>
+  <alias binding='strong'>
     <family>serif</family>
     <prefer>
       <family>DejaVu Serif</family>
-      <family>monapo</family>
     </prefer>
   </alias>
   <alias>
+    <family>serif</family>
+    <prefer>
+      <family>monapo</family>
+    </prefer>
+  </alias>
+  <alias binding='strong'>
     <family>sans-serif</family>
     <prefer>
       <family>DejaVu Sans</family>