Small text edit.

gui/src/components/dataset/DatasetsPage.js

@@ -109,7 +109,7 @@ const DatasetActions = React.memo(function VisitDatasetAction({data}) {
     ? !data.doi
       ? 'Assign a DOI'
       : 'Dataset already has a DOI'
-    : 'Cannot create a DOI because the DataCite service is not enabled on this deployment.'
+    : 'Cannot create a DOI because the DataCite service is not enabled on this deployment'
 
   return <React.Fragment>
     {<Tooltip title={tooltip}>