Merge of "in-portal/branches/5.2.x@16599" to "in-portal/branches/5.3.x@16597".
Fixes INP-1331 - Integrate Plupload
Merge of "in-portal/releases/5.2.1-B2@15839" to "in-portal/branches/5.3.x@15852".
Releasing version 'branches/5.3.x' (copy from 'branches/5.2.x') of 'in-portal' module.
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