1108 - Fix usage of `superadmin` and `admin` across the plugin #576

Job	Run time
Coding Standard & Static Analysis	20s
testsuite (8.1, sqlite)	13s
testsuite (8.1, mysql)	25s
testsuite (8.1, pgsql)	24s
testsuite (8.2, sqlite)	18s
testsuite (8.2, mysql)	24s
testsuite (8.2, pgsql)	16s
testsuite (8.3, sqlite)	20s
testsuite (8.3, mysql)	29s
testsuite (8.3, pgsql)	26s
	3m 35s

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