Issue 2148 - Rewrite the testpages test suite

pages/exceptions/image.tmpl

-title = $image Exception - ABP Test Pages
+title = $image Exception
 template = testcase
 
 {% set testcase_moreinfo = [
   ("Filter Options", "https://adblockplus.org/filters#options"),
 ] %}
 
 <link rel="stylesheet" href="/testcasefiles/imageexception/stylesheet.css">
 
 <section class="site-panel">
   <h2>$image Exception</h2>
   <p>Check that usage of the $image filter option in an exception filter works as expected.</p>
+  <p>With the filter(s) displayed below each test case added to ABP (or with the testcase subscription installed and active), the image should not be blocked while the stylesheet should be.</p>
 </section>
 
 <section class="site-panel">
   <h2>Test case</h2>
   <p>The image should not be blocked (exception). The stylesheet should be blocked.</p>
   <div class="testcase-container">
     <div class="testcase-row">
       <h3>Image</h3><img class="testcase-image" src="/testcasefiles/imageexception/image.jpg"/>
     </div>
     <div class="testcase-row">
       <h3>Stylesheet</h3><div class="testcase-teststylesheet"></div>
     </div>
   </div>
   <h3>Filters</h3>
-  ||testpages.adblockplus.org/testcasefiles/imageexception/*<br>
-  @@testpages.adblockplus.org/testcasefiles/imageexception/$image
+  <pre>||testpages.adblockplus.org/testcasefiles/imageexception/*</pre>
+  <pre>@@testpages.adblockplus.org/testcasefiles/imageexception/$image</pre>
 </section>