docs: clarify i18n validation loop #323

Job	Run time
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu)	7m 27s
build (windows-latest, x86_64-pc-windows-msvc)	7m 39s
build (windows-latest, aarch64-pc-windows-msvc)	7m 49s
build (ubuntu-22.04, x86_64-unknown-linux-gnu)	5m 56s
	28m 51s

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