fix: pass down locale to IntlProvider #14806

Job	Run time
Core Basic (18.x)	6m 8s
Core Basic - Plone 5 (18.x)	6m 46s
Core Basic (20.x)	5m 56s
Core Blocks (18.x)	7m 8s
Core Blocks - Listing (18.x)	4m 49s
Core Blocks (20.x)	7m 7s
Core Content (18.x)	2m 58s
Core Blocks - Listing (20.x)	4m 31s
Core Content (20.x)	2m 49s
Core Control Panels (18.x)	4m 5s
Coresandbox (18.x)	3m 53s
Core Control Panels (20.x)	4m 0s
Core Volto Slate (18.x)	7m 55s
Core Volto Slate (20.x)	7m 9s
Multilingual (18.x)	2m 51s
Working Copy (18.x)	4m 32s
Project Generator (18.x)	7m 12s
Multilingual in Seamless Mode (18.x)	3m 5s
Project Generator (20.x)	6m 34s
Seamless Mode (18.x)	6m 4s
	1h 45m 32s

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