Hi Erik Nordin
Yes, it's correct. The name and description of Composer content blocks are using the translation and the language files in the same way as CMS :)
Sample:
<pagetype name="[ExtensionSys] Article">
<description>Redigering med textformatering med rubrik och brödtext</description>
<name>Textformatering</name>
</pagetype>
/Regards
Hieu Doan