#173858 by myself: skip UTF-8 BOM when importing locale files

includes/locale.inc

@@ -1015,6 +1015,10 @@ function _locale_import_read_po($op, $file, $mode = NULL, $lang = NULL, $group =
 
   while (!feof($fd)) {
     $line = fgets($fd, 10*1024); // A line should not be this long
+    if ($lineno == 0) {
+      // The first line might come with a UTF-8 BOM, which should be removed. 
+      $line = str_replace("\xEF\xBB\xBF", '', $line);
+    }
     $lineno++;
     $line = trim(strtr($line, array("\\\n" => "")));