Typo in RDF for observable:MessageThread

[chrishargreaves]

Bug description

There is a typo in observable:MessageThread which has rdfs:label
"MessageTread"@en — should be "MessageThread"@en.

Steps to reproduce

visit:

UCO/ontology/uco/observable/observable.ttl

Line 4132 in 8335d32

rdfs:label "MessageTread"@en ;