test

Add `/macros` redirect to current language spec (#5684) #696

Job	Run time
Build site and check links	1m 4s
Check if code excerpts are up to date	44s
Validate Firebase configuration	22s
Analyze and test code examples (beta, false)	2m 59s
Analyze and test code examples (stable, false)	3m 35s
	8m 44s

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