I18N: Use `wp_get_list_item_separator()` as list separator for the st… #23424

Job	Run time
QUnit Tests / Run QUnit tests	2m 24s
Slack Notifications / Prepare notifications	6s
Slack Notifications / Success notifications	3s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Failure notifications	0s
Slack Notifications / Fixed notifications	-1s
Failed workflow tasks	-1s
	2m 31s

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