Hiya,
I'm not seeing the new classes in either of your XML files.
If you have already placed the styles in your CMS/css/cms_styles.css stylesheet, then you just need to add the class names into these two xml files:
HTMLEditor/custom/contents_insert_ContentValueStyles1.xml
HTMLEditor/custom/contents_update_ContentValueStyles1.xml
Each style name appears twice in a style block in the form of:
<Style name="myStyle" element="span">
<Attribute name="class" value="myStyle"/>
</Style>
So if (for instance) you have two classes called .firstStyle and .secondStyle, then your xml files would look like:
<?xml version="1.0" encoding="UTF-8"?>
<Styles>
<Style name="firstStyle" element="span">
<Attribute name="class" value="firstStyle"/>
</Style>
<Style name="secondStyle" element="span">
<Attribute name="class" value="secondStyle"/>
</Style>
</Styles>
Note: Don't include the dot before the class name in the xml blocks.