cache administration: prepopulate memcached settings and fix message upon...

cache administration: prepopulate memcached settings and fix message upon storing, fixes #1536 (closed), fixes #1124 (closed)

assigned to @tleilax

approved this merge request

added 6 commits

• cc6438df...b855a45f - 5 commits from branch main
• 85f96fd1 - cache administration: prepopulate memcached settings and fix message upon...

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