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In Joomla, when a new article is being created that is not linked with a blog or menu element it will show "Articles" (Beiträge) as a H1-Element on top of the page.
Edit the overlay default.php class and comment out the code that is responsible for this behaviour.
If you are using page titles on your site and have enabled them so that a h1-title is being automatically created for each article you cannot just comment out this code. Instead you'll need to assign these articles to a menu to be able to suppress the page title output with the joomla "show page title" option.
Edit the file
/components/com_content/views/article/tmpl/default.php
From line #24 you'll find this:
<h1> <?php echo $this->escape($this->params->get('page_heading')); ?> </h1>
Comment out the echo-function like this and save the file:
<h1> <?php //echo $this->escape($this->params->get('page_heading')); ?> </h1>
Done!