Scheduled publication displayed as "Unknown task scheduled on ...."

(Install demosuite and run cms)

• log in as admin
• open documents workspace
• browse to demosite/common
• open folder context menu
• choose add new document
• give document name e.g. test and choose type textdocument
• fill in fields in new document
• save new document
• open publication menu in menu bar
• choose schedule publication
• in dialog enter a date > now
• click OK
• menu bar will show "Unknown task scheduled on [date]" (see screenshot)
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  Reproduction path on 2.16.12
  1. login to CMS
  2. Navigate to documents >> news (any folder) >> context menu >> add new document
  3. Enter test content and schedule a publication
  4. After the document is published take the document offline
  5. Make some change and again schedule the document for publication
  Expected - It should carry a message "Scheduled publication on <time stamp>"
  Actual - Unknown is shown in the message (refer screen-shot)