MNT Fix test that didn't account for i18n spaces #614

Job	Run time
CI / Generate matrix	11s
CI / Context	1s
CI / Check governance	0s
CI / 8.1 prf-low mysql57 phpunit all	2m 29s
CI / 8.2 mariadb phpunit all	2m 37s
CI / 8.3 mysql80 phpunit all	3m 36s
CI / 8.1 mysql57 phplinting	1m 33s
CI / 8.1 mysql57 endtoend asset-admin	18m 21s
CI / 8.1 mysql57 endtoend versioned-admin	8m 38s
CI / 8.1 mysql57 endtoend silverstripe-elemental	43m 24s
CI / Dispatch tag patch release	0s
	1h 20m 50s

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