fix: Provide frontend plugin change forms with plugin language (#295)

Co-authored-by: sourcery-ai[bot] <58596630+sourcery-ai[bot]@users.noreply.github.com>

Author: fsbraun

djangocms_frontend/templates/djangocms_frontend/admin/base-collapse.html

@@ -3,6 +3,9 @@
 
 {% block extrahead %}
     <link rel="stylesheet" href="{% static 'djangocms_frontend/css/base.css' %}"/>
+    {% with get_plugin_language=request.GET.plugin_language %}
+      <meta name="plugin_language" data-plugin-language="{{ plugin.language|default:get_plugin_language }}">
+    {% endwith %}
     {{ block.super }}
 {% endblock %}
 

djangocms_frontend/templates/djangocms_frontend/admin/base-tabs.html

@@ -3,6 +3,9 @@
 {% block extrahead %}
     <link rel="stylesheet" href="{% static 'djangocms_frontend/css/base.css' %}"/>
     <script src="{% static 'djangocms_frontend/js/bundle.base.js' %}"></script>
+    {% with get_plugin_language=request.GET.plugin_language %}
+      <meta name="plugin_language" data-plugin-language="{{ plugin.language|default:get_plugin_language }}">
+    {% endwith %}
     {{ block.super }}
 {% endblock %}
 {% block content_subtitle %}{% endblock %}