Add definitions for cases in quarantine and cases placed in quarantine to glossary

[bernardsilenou]

• Add definitions for cases in quarantine and cases placed in quarantine to glossary

• "Cases in quarantine" = cases occurring within specified time filter and have been in quarantine. That is the quarantine start and and must not necessarily fall in the time interval.
  "Cases placed in quarantine" = cases occurring within specified and their quarantine start also fall in the time interval

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