Improve cluster table format

Go to Operations->Kubernetes. If any cluster exists, you can see a table with cluster information. This table contains three columns but only two of them have titles. Screenshot_2019-11-07_at_13.59.02

It will be nice to reorganize this table or add a title for the last column ("Type" or "Access level", maybe?)

/cc @dzaporozhets @danielgruesso

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