--- index.php	2013-09-20 23:29:45.000000000 +0200
+++ index.php.new	2014-06-03 23:51:15.000000000 +0200
@@ -343,7 +343,7 @@
 } 
 
 if (!$ajax) {
-  print '<h4 class="pagetitle">'.strtolower($page_title).'</h4>';
+  print '<h4 class="pagetitle">'.mb_strtolower($page_title).'</h4>';
 }
 
 if ($GLOBALS["require_login"] && $page != "login") {
@@ -589,7 +589,7 @@
       $par = substr($clinearg,1,1);
       $clinearg = substr($clinearg,2,strlen($clinearg));
      # $res[$par] = "";
-      $cur = strtolower($par);
+      $cur = mb_strtolower($par);
       $res[$cur] .= $clinearg;
      } elseif ($cur) {
       if ($res[$cur])

--- connect.php	2014-04-15 00:11:27.000000000 +0200
+++ connect.php.new	2014-06-04 12:10:55.088751687 +0200
@@ -734,7 +734,7 @@
   $spb = '<li class="shade0">';
 #  $spb = '<li class="shade2">';
   $spe = '</li>';
-  $nm = strtolower(NAME);
+  $nm = mb_strtolower(NAME);
   if ($nm != "phplist") {
     $GLOBALS["context_menu"]["community"] = "";
   }
@@ -1075,7 +1075,7 @@
       return '<!-- '.$desc.'-->';
     elseif ($name == "processbounces" && !MANUALLY_PROCESS_BOUNCES) return '<!-- ' . $desc . '-->';
     else
-      return sprintf('<a href="./?page=%s%s" target="phplistwindow">%s</a>',$name,$url,strtolower($desc));
+      return sprintf('<a href="./?page=%s%s" target="phplistwindow">%s</a>',$name,$url,mb_strtolower($desc));
   } else
     return "\n<!--$name disabled $access -->\n";
 #    return "\n$name disabled $access\n";
@@ -1259,7 +1259,7 @@
 
 function phpcfgsize2bytes($val) {
   $val = trim($val);
-  $last = strtolower($val{strlen($val)-1});
+  $last = mb_strtolower($val{strlen($val)-1});
   switch($last) {
     case 'g':
         $val *= 1024;

--- commonlib/lib/interfacelib.php	2013-05-10 17:52:44.000000000 +0200
+++ commonlib/lib/interfacelib.php.new	2014-06-03 23:57:43.000000000 +0200
@@ -173,7 +173,7 @@
     $this->addElement($name);
     $this->addColumn($name,"value",
       sprintf('<input type="text" name="%s" value="%s" size="40" class="listinginput" />',
-      strtolower($name),$value));
+      mb_strtolower($name),$value));
   }
 
   function addButton($name,$url) {
@@ -203,7 +203,7 @@
       $tophelp = $this->help;
     }
     $html = '<tr valign="top">';
-    $html .= sprintf('<th><a name="%s"></a><div class="listinghdname">%s%s</div></th>',str_replace(" ","_",htmlspecialchars(strtolower($this->title))),$tophelp,$this->title);
+    $html .= sprintf('<th><a name="%s"></a><div class="listinghdname">%s%s</div></th>',str_replace(" ","_",htmlspecialchars(mb_strtolower($this->title))),$tophelp,$this->title);
     $c = 1;
     foreach ($this->columns as $column => $columnname) {
       if ($c == sizeof($this->columns)) {
@@ -465,7 +465,7 @@
       $tophelp = $this->help;
     }
     $html = '<tr valign="top">';
-    $html .= sprintf('<th><a name="%s"></a><div class="listinghdname">%s%s</div></th>',str_replace(" ","_",htmlspecialchars(strtolower($this->title))),$tophelp,$this->title);
+    $html .= sprintf('<th><a name="%s"></a><div class="listinghdname">%s%s</div></th>',str_replace(" ","_",htmlspecialchars(mb_strtolower($this->title))),$tophelp,$this->title);
     $c = 1;
     foreach ($this->columns as $column => $columnname) {
       if ($c == sizeof($this->columns)) {
@@ -653,13 +653,13 @@
         <ul class="domtabs">
         ';
     foreach ($this->tabs as $title => $content) {
-      $html .= sprintf('<li><a href="#%s" title="%s">%s</a></li>',$this->domtabcluster.urlencode(strtolower($title)),htmlspecialchars($title),$title);
+      $html .= sprintf('<li><a href="#%s" title="%s">%s</a></li>',$this->domtabcluster.urlencode(mb_strtolower($title)),htmlspecialchars($title),$title);
     }
     $html .= '</ul>';
 
     foreach ($this->tabs as $title => $content) {
       $html .= '<div style="display: none;">';
-      $html .= sprintf('<h4><a name="%s" id="%s"><span class="hide">%s</span></a></h4>',$this->domtabcluster.strtolower($title),$this->domtabcluster.urlencode(strtolower($title)),$title);
+      $html .= sprintf('<h4><a name="%s" id="%s"><span class="hide">%s</span></a></h4>',$this->domtabcluster.mb_strtolower($title),$this->domtabcluster.urlencode(strtolower($title)),$title);
       $html .= $content;
       $html .= '</div>';
     }
@@ -861,7 +861,7 @@
   }
 
   function setCurrent($name) {
-    $this->current = strtolower($name);
+    $this->current = mb_strtolower($name);
   }
 
   function previousLink() {
@@ -925,7 +925,7 @@
     $count = 0;
     foreach ($this->tabs as $tab => $url) {
       $count++;
-      if (strtolower(strip_tags($tab)) == $this->current) {
+      if (mb_strtolower(strip_tags($tab)) == $this->current) {
         $this->previous = $previous;
         $gotcurrent = true;
         $html .= '<li class="current" id="'.$count.'">';