Update copy for l10n

bedrock/firefox/templates/firefox/features/adblocker.html

@@ -115,7 +115,7 @@
     <h2 class="section-title">{{_('Do-it-yourself Custom mode') }}</h2>
     <p>
       {% trans %}
-      The custom setting gives you the ultimate choice. You can decide what you’re blocking, including trackers, cookies and more. If you allow cookies from a website, you’ll automatically be in Custom mode.
+      The Custom setting gives you the ultimate choice. You can decide what you’re blocking, including trackers, cookies and more. If you allow cookies from a website, you’ll automatically be in Custom mode.
       {% endtrans %}
     </p>
   </section>
@@ -128,7 +128,7 @@
     <h2 class="section-title">{{_('Cover your trail, block trackers') }}</h2>
     <p>
       {% trans %}
-      Click on the trackers box and you’ll be able to block trackers in two ways. One way to block trackers is to do it when you’re working in a Private Window. Another way to do it is to block trackers in all windows. Keep in mind that if you choose to always block trackers, some pages might not load correctly.
+      Click on the Trackers box and you’ll be able to block trackers in two ways. One way to block trackers is to do it when you’re working in a Private Window. Another way to do it is to block trackers in all windows. Keep in mind that if you choose to always block trackers, some pages might not load correctly.
       {% endtrans %}
     </p>
     {{ high_res_img('firefox/features/adblocker/custom-trackers.png', {'alt': ''}) }}