make IP addr easier to copy

public/index.html

@@ -18,7 +18,7 @@
     <article id="main">
         <div class="container">
             <noscript><div class="error show">This Selftest requires JavaScript to run. Please enable it in your browser.</div></noscript>
-            <div id="info-ip" class="info">Your IP Address is <span id="ip"></span>.</div>
+            <div id="info-ip" class="info">Your IP Address is: <span id="ip"></span></div>
             <div id="error-browser" class="error">Your Browser is not supported. Please try another one.</div>
             <div id="error-external" class="error">Your IP Address does not belong to the StuStaNet!<br />
             Please make sure you are not using mobile internet, deactivated all VPNs / data savers / or third-party proxies and try again.</div>