Don't chop utf-8 strings in the middle of a character

htdocs/lib/web.php

@@ -2367,11 +2367,11 @@ function str_shorten($str, $maxlen=100, $truncate=false, $newlines=true) {
     $str = html_entity_decode($str); // no things like   only take up one character
     // take the first $length chars, then up to the first space (max length $length + $extra chars)
 
-    if ($truncate && strlen($str) > $maxlen) {
-        $str = substr($str, 0, $maxlen-3) . '...';
+    if ($truncate && mb_strlen($str, 'UTF-8') > $maxlen) {
+        $str = mb_substr($str, 0, $maxlen-3, 'UTF-8') . '...';
     }
-    if (strlen($str) > $maxlen) {
-        $str =  substr($str, 0, floor($maxlen / 2) - 1) . '...' . substr($str, -(floor($maxlen / 2) - 2));
+    if (mb_strlen($str) > $maxlen) {
+        $str = mb_substr($str, 0, floor($maxlen / 2) - 1, 'UTF-8') . '...' . mb_substr($str, -(floor($maxlen / 2) - 2), mb_strlen($str, 'UTF-8'), 'UTF-8');
     }
     $str = nl2br(hsc($str));
     // this should be ok, because the string gets checked before going into the database