One more spelling fix

git-svn-id: svn+ssh://svn.gnucash.org/repo/htdocs/branches/beta@20869 57a11ea4-9604-0410-9ed3-97b8803252fd

features.phtml

@@ -210,7 +210,7 @@ include("$top_dir/externals/menu.phtml");
 <h2 class="featuretitle"><?php echo T_("Multiplatform");?></h2>
 </div>
 <p class="justify">
-<?php echo T_("GnuCash can be executed on different operating system. The most commonly used OS's like <b>Windows</b>, <b>MacOSX</b> and <b>Linux</b>, are supported along with many others.");?></p>
+<?php echo T_("GnuCash can be executed on different operating systems. The most commonly used OS's like <b>Windows</b>, <b>MacOSX</b> and <b>Linux</b>, are supported along with many others.");?></p>
 <br clear="all">
 </div>