Adopt recent changes, migrate product detail page

public/typo3conf/ext/ep_theme/Configuration/TypoScript/ContentElements/nlform.typoscript

@@ -1,4 +1,9 @@
 tt_content.nlform =< lib.contentElement
 tt_content.nlform {
     templateName = NewsletterForm
+    variables {
+        formUrl = TEXT
+        formUrl.wrap = |/buchung/anmeldung_news.php
+        formUrl.data = site:base
+    }
 }

public/typo3conf/ext/ep_theme/Configuration/TypoScript/Page/Main.typoscript

@@ -133,6 +133,18 @@ page {
         settings < plugin.tx_eptheme.settings
     }
 
+    headerData.998 = TEXT
+    headerData.998.value (
+        <!-- Google Tag Manager -->
+        <script type="text/plain" data-cookiefirst-category="functional">(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+        new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+        j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+        'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+        })(window,document,'script','dataLayer','{$plugin.tx_eptheme.settings.googleTagManagerId}');</script>
+        <!-- End Google Tag Manager -->
+    )
+    headerData.998.stdWrap.if.isTrue = {$plugin.tx_eptheme.settings.googleTagManagerId}
+
     headerData.999 = TEXT
     headerData.999 {
         wrap = <script src="https://consent.cookiefirst.com/banner.js" data-cookiefirst-key="|"></script>