I think it's will be use full if we have parameter to config Show/Hide this
Text.
=====
#Open file config.xml for add new global parameter
at /administrator/components/com_content/
Add new field parameter before <field name="show_subcat_desc" at
line: 490
<field name="show_category_heading_title_text"
type="radio"
label="JGLOBAL_SHOW_CATEGORY_HEADING_TITLE_TEXT_LABEL"
description="JGLOBAL_SHOW_CATEGORY_HEADING_TITLE_TEXT_DESC"
default="1">
<option value="0">JHIDE</option>
<option value="1">JSHOW</option>
</field>
#Open file default.xml
at /components/com_content/views/category/tmpl/
Add new field parameter before <field name="show_subcat_desc" at
line: 89
<field name="show_category_heading_title"
type="list"
label="JGLOBAL_SHOW_CATEGORY_HEADING_TITLE_TEXT_LABEL"
description="JGLOBAL_SHOW_CATEGORY_HEADING_TITLE_TEXT_DESC">
<option value="">JGLOBAL_USE_GLOBAL</option>
<option value="0">JHIDE</option>
<option value="1">JSHOW</option>
</field>
#Open file default.php
Add new php get parameter check at line: 50 befor <h3> to under
</h3>
<?php if ($this->params->get('show_category_heading_title_text') ==
1)
>
<h3>
<?php echo JTEXT::_('JGLOBAL_SUBCATEGORIES'); ?>
</h3>
<?php endif; ?>
#Open file en-GB.ini
at /administrator/language/en-GB
Add new line before line: 413
JGLOBAL_SHOW_CATEGORY_HEADING_TITLE_TEXT_LABEL="Show Subcategories
Text”"
JGLOBAL_SHOW_CATEGORY_HEADING_TITLE_TEXT_DESC="If Show, the
"Subcategories" will show as a subheading on the page. The
subheading is usually displayed inside the "H3" tag."
====end===