you can’t clone the cmsdefaultsystempages theme, because it’s not a theme. The folder is build like a theme but it isn’t. The cmsdefaultsystempages folder should be seen as a summary of templates and files that are beeing cloned to your specific theme if it doesn’t have those themes/files…
Customizing the system page templates can be done only in the design manager since there’s currently no visual editor like in emails/web-/landing pages to modify them. Could you please specify what you’d like to customize?
In order to change the change the translation you have to:
Look in the templates/_locales/LANGUAGE/messages.json(every language/tranlation has it’s own folder) file
Apply your changes in this file and save it
If you’re don’t want to have translations, you can either replace the {{ template_translations.member_access_denied_heading.message }} with some plain text, or create your own variables file and put the texts like this(see below) in it
Example of a custom variables file:
{% set error_headline = "Ooops!" %}
{% set error_message = "something went wrong. Help is on it's way" %}
Once you’ve created this file, you can load it into the template like
{% set template_css = "../css/templates/error.css" %}
{% set font_config = {
"Source Serif Pro": ["600"],
"Montserrat": ["300", "400", "500", "700"]
} %}
{# if you're implementing the template into your theme, you might want to get rid of this font and CSS info above. #}
{% extends "../membership-base.html" %} {# if you're implementing the template into your theme, you need to either copy the membership-base template to your theme or change it to your base layout file(you'll most likely will need to do some further adjustments) #}
{% include 'PATH-TO-FILE.html' %}
...
<h1>{{ error_headline }}</h1>
<p>{{ error_message }}</p>
