Dev-Umgebung: Kompatibilität für PHP 8.3 + Smarty 4.5.6

- Smarty 4.1.1 → 4.5.6 (behebt dynamic property deprecations)
- Core-Klassen: #[\AllowDynamicProperties] für Admin_role, base, Config,
  Customer, Customer_group, CustomerGroups, Item, Structure, website
- website.class.php: counts[parent_id] initialisieren vor ++ (PHP 8.1)
- layout.class.php: HTTP_ACCEPT_LANGUAGE mit isset-Guard
- website_init.php: session_status()-Check vor session_start
- .htaccess: HTTPS-Redirect via X-Forwarded-Proto (statt SERVER_PORT)
- themes/easyshop_advanced/media/: Parent-Theme-Assets nachgezogen
- .gitignore: smarty.4.1.1.bak ausschließen

libs/smarty/docs/designers/language-modifiers/language-modifier-replace.md

@@ -0,0 +1,45 @@
+# replace
+
+A simple search and replace on a variable. This is equivalent to the
+PHP's [`str_replace()`](https://www.php.net/str_replace) function.
+
+## Basic usage
+```smarty
+{$myVar|replace:"foo":"bar"}
+```
+
+## Parameters
+
+| Parameter Position | Type   | Required | Description                                 |
+|--------------------|--------|----------|---------------------------------------------|
+| 1                  | string | Yes      | This is the string of text to be replaced.  |
+| 2                  | string | Yes      | This is the string of text to replace with. |
+
+
+## Examples
+
+```php
+<?php
+
+$smarty->assign('articleTitle', "Child's Stool Great for Use in Garden.");
+
+```
+
+Where template is:
+
+```smarty
+{$articleTitle}
+{$articleTitle|replace:'Garden':'Vineyard'}
+{$articleTitle|replace:' ':'   '}
+```
+       
+Will output:
+
+```
+Child's Stool Great for Use in Garden.
+Child's Stool Great for Use in Vineyard.
+Child's   Stool   Great   for   Use   in   Garden.
+```
+
+See also [`regex_replace`](language-modifier-regex-replace.md) and
+[`escape`](language-modifier-escape.md).