issue #2405 update smarty

and made Piwigo compatible with smarty 5.x

include/smarty/src/Compile/Modifier/CountCharactersModifierCompiler.php

@@ -0,0 +1,21 @@
+<?php
+namespace Smarty\Compile\Modifier;
+/**
+ * Smarty count_characters modifier plugin
+ * Type:     modifier
+ * Name:     count_characters
+ * Purpose:  count the number of characters in a text
+ *
+ * @author Uwe Tews
+ */
+
+class CountCharactersModifierCompiler extends Base {
+
+	public function compile($params, \Smarty\Compiler\Template $compiler) {
+		if (!isset($params[ 1 ]) || $params[ 1 ] !== 'true') {
+			return 'preg_match_all(\'/[^\s]/' . \Smarty\Smarty::$_UTF8_MODIFIER . '\',' . $params[ 0 ] . ', $tmp)';
+		}
+		return 'mb_strlen((string) ' . $params[ 0 ] . ', \'' . addslashes(\Smarty\Smarty::$_CHARSET) . '\')';
+	}
+
+}