1108 - Fix usage of `superadmin` and `admin` across the plugin #585

Job	Run time
testsuite (8.1, sqlite)	21s
Coding Standard & Static Analysis	28s
testsuite (8.1, mysql)	34s
testsuite (8.1, pgsql)	29s
testsuite (8.2, sqlite)	34s
testsuite (8.2, mysql)	34s
testsuite (8.2, pgsql)	33s
testsuite (8.3, sqlite)	28s
testsuite (8.3, mysql)	33s
testsuite (8.3, pgsql)	27s
	5m 1s

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