Fix error in displayLabel for <relatedItem> for collection info

The displayLabel attribute was set to "Project" - not sure why,
was this code copied from somethwhere? Anyway, it has been changed
to the correct value, "Collection"
Regenerate MODS files due to fix in XLST

For the collection information, the XSLT was setting the displayLabel
attribute of the <relatedItem> element to "Project". The correct value
is "Collection".