1. Fixes #0000710: Check all Sub-Item Edit templates and place Prev/Next buttons on them
Fixes #0000683: Preventing the Deletion of specific Sections in the Catalog
Fixes #0000107: Implement "MemCached" functionality
Merge of "in-portal/releases/5.0.2@13073" to "in-portal/branches/5.1.x@12657".
Reintegrate merge of "in-portal/releases/5.0.1@12617" to "in-portal/branches/5.1.x@12453".
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