Increase filter box size on bigger screens

Customize size depending on the screen sizes so it's rendered bigger on
computer devices while mantaining the same aspect in smaller devices

issue5879

review30481002

src/screen.js

@@ -108,7 +108,7 @@
                     .append(this.but_bookmark)
                     .append(dropdown_bookmark))
             .appendTo(jQuery('<div/>', {
-                'class': 'col-md-8'
+                'class': 'col-sm-10 col-xs-12'
             }).appendTo(search_row));
 
 
@@ -138,7 +138,7 @@
             .append(this.but_prev)
             .append(this.but_next)
             .appendTo(jQuery('<div/>', {
-                'class': 'col-md-4'
+                'class': 'col-sm-2 pull-right'
             }).appendTo(search_row));
 
             this.content_box = jQuery('<div/>', {