Update speedtestcli.php

Added translation variable "Speedtest_Results"

front/php/server/speedtestcli.php

@@ -1,10 +1,10 @@
 <?php
 exec('../../../back/speedtest-cli --secure --simple', $output);
 
-echo '<h4>Speedtest Results</h4>';
+echo '<h4>. lang('Speedtest_Results') .</h4>';
 echo '<pre style="border: none;">'; 
 foreach($output as $line){
     echo $line . "\n";
 }
 echo '</pre>';
-?>
+?>