Make the label of the "Parse content" JSX and SSX properties more self-explanatory

In JSX objects, even though the Parse content property is well documented in the SkinExtensionsTutorial on xwiki.org, using a more self-explanatory would be helfpul for new XWiki developers.

What about something like "Interpret Velocity code" or anything similar? (using "code" here rather than "content" to be consistent with the "code" label of the "code" property)