Add missing period

wiki/src/install/inc/steps/download_2.inline.html

@@ -9,7 +9,7 @@
     <div class="supported-browser no-js">
       <h3><span class="step-number">1.</span>Download Tails</h3>
       <a href="[[!inline pages="inc/stable_amd64_iso_url" raw="yes" sort="age"]]" id="download-iso" class="use-mirror-pool btn btn-primary indent">Download Tails 3.1 ISO image (1.2 GB)</a>
-      <p class="indent"><a id="already-downloaded">I already downloaded Tails 3.1</a></p>
+      <p class="indent"><a id="already-downloaded">I already downloaded Tails 3.1.</a></p>
 
       <div id="step-verify-direct">
         <h3><span class="step-number">2.</span>Verify your download using your browser</h3>