fix(i18n): metadata label lookup honours the declared fallbackLocale … #31061

Job	Run time
filter	4s
Test Core	16s
Dogfood Regression Gate	15s
Temporal Conformance (live PG + MySQL)	1s
Dogfood Verify CLI	1s
Build Core	1s
Console Pin Gate	1s
Test Core (${{ matrix.shard }}/6)	1s
Dogfood Regression Gate (${{ matrix.shard }}/3)	1s
Build Docs	1s
	42s

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