Mohammad Taqui Sayed

Im sorry you had trouble, but this should be asked on the related plugin forum. Translation works perfect on supernova and there is no problem whatsoever, if your current plugin doesn’t work , you should try , some other plugin like http://wordpress.org/plugins/transposh-translation-filter-for-wordpress/
Let me know if you have any other issues.

Use a custom css plugin and paste these css there.
And for slider use this

.featured_content h3 {text-transform:none}

There is no option in the theme however you use this css to make it lower case

#nav li a {text-transform: none;}
.post_title a {text-transform:none}

supernova_title_image() is a function that you will find under lib/function/custom-functions.php

Well its my personal experience that 95% of the time, its a plugin which creates conflict, so deactivate each plugin one by one to see which one is causing problem.

You should use child theme for making changes, I m going to add so many awesome features in supernova, you would not get any of those. Also the new version loads must faster than before.

I just noticed you are using version 1.0 which was not even released. That version had some issues that’s why we update themes.
Please use the latest version.

I m sorry , Im not sure why it is happening but you can remove the things that are showing errors.
since you are not using sticky navigation, you can remove this

<script>
jQuery("#top_most, #media_nav").SupernovaSticky({ topSpacing: 0 });
</script>

its in custom-css.php from line number 90 to 92

Also since you are not using slider , you can remove

<script type="text/javascript">
    jQuery(window).load(function(){
      jQuery('.flexslider').flexslider({
        animation: "<?php if($supernova_options['fade-slider']=='fade'){echo "fade"; }else{ echo "slide"; } ?>" ,
        start: function(slider){
          jQuery('body').removeClass('loading');
        }});});
  </script>

its from line number 106 to 113.