whitespace cleanup

(cherry picked from commit 8028daee)

src/www/system_advanced_admin.php

@@ -508,7 +508,7 @@ include("head.inc");
                     <input name="enableserial" type="checkbox" id="enableserial" value="yes" <?=!empty($pconfig['enableserial']) ? "checked=\"checked\"" : "";?> />
                     <strong><?=gettext("Enables the first serial port with 115200/8/N/1 by default, or another speed selectable below."); ?></strong>
                     <div class="hidden" for="help_for_enableserial">
-                      <?=gettext("Note:  This will redirect the console output and messages to the serial port. You can still access the console menu from the internal video card/keyboard. A <b>null modem</b> serial cable or adapter is required to use the serial console."); ?>
+                      <?=gettext("Note: This will redirect the console output and messages to the serial port. You can still access the console menu from the internal video card/keyboard. A null modem serial cable or adapter is required to use the serial console."); ?>
                     </div>
                   </td>
                 </tr>

src/www/system_advanced_firewall.php

@@ -542,19 +542,19 @@ include("head.inc");
                       <table class="table table-condensed">
                         <tr>
                           <td><strong><?=gettext("normal");?></strong></td>
-                          <td><?=gettext("as the name says, it is the normal optimization algorithm");?></td>
+                          <td><?=gettext("As the name says, it is the normal optimization algorithm");?></td>
                         </tr>
                         <tr>
                           <td><strong><?=gettext("high-latency");?></strong></td>
-                          <td><?=gettext("used for high latency links, such as satellite links.  Expires idle connections later than default");?></td>
+                          <td><?=gettext("Used for high latency links, such as satellite links. Expires idle connections later than default");?></td>
                         </tr>
                         <tr>
                           <td><strong><?=gettext("aggressive");?></strong></td>
-                          <td><?=gettext("expires idle connections quicker. More efficient use of CPU and memory but can drop legitimate idle connections");?></td>
+                          <td><?=gettext("Expires idle connections quicker. More efficient use of CPU and memory but can drop legitimate idle connections");?></td>
                         </tr>
                         <tr>
                           <td><strong><?=gettext("conservative");?></strong></td>
-                          <td><?=gettext("tries to avoid dropping any legitimate idle connections at the expense of increased memory usage and CPU utilization.");?></td>
+                          <td><?=gettext("Tries to avoid dropping any legitimate idle connections at the expense of increased memory usage and CPU utilization.");?></td>
                         </tr>
                       </table>
                       <hr/>

src/www/system_advanced_sysctl.php

@@ -223,7 +223,7 @@ $( document ).ready(function() {
                     <td>&nbsp;</td>
                     <td>
                       <input name="Submit" type="submit" class="btn btn-primary" value="<?=gettext("Save"); ?>" />
-                      <input type="button" class="btn btn-default" value="<?=gettext("Cancel");?>" onclick="window.location.href='<?=(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '/system_advanced_sysctl.php');?>'" />
+                      <input type="button" class="btn btn-default" value="<?=gettext("Cancel");?>" onclick="window.location.href='<?=(isset($_SERVER['HTTP_REFERER']) ? html_safe($_SERVER['HTTP_REFERER']) : '/system_advanced_sysctl.php');?>'" />
 
 <?php
                       if (isset($id)) :?>