Add missing collection discover page translations

Author: futa-ikeda

translations/en-us.yml

@@ -990,6 +990,8 @@ collections:
  volume: Volume
  study_design: 'Study Design'
  school_type: 'School Type'
+ data_type: 'Data Type'
+ disease: Disease
  collections_submission:
  title: Submit
  add_header: 'Add to Collection'