Merged new caliblur theme

Fix for new users created
Fix for options to the calibre-converter
Only the first 300 chars are logged for the emailbody (spamming of logfile is prevented)
Added class to "Random" header

cps/templates/index.html

@@ -2,7 +2,7 @@
 {% block body %}
 {% if g.user.show_detail_random() %}
 <div class="discover">
-  <h2>{{_('Discover (Random Books)')}}</h2>
+  <h2 class="random-books">{{_('Discover (Random Books)')}}</h2>
   <div class="row">
 
     {% for entry in random %}