fix(example-showcase): translate the app sidebar so a zh-CN session stops mixing locales #21311

Job	Run time
filter	12s
Dogfood Verify CLI	1m 35s
Dogfood Regression Gate (2/3)	3m 34s
Dogfood Regression Gate (3/3)	3m 35s
Test Core (2/3)	1m 7s
Temporal Conformance (live PG + MySQL)	3m 25s
Test Core (3/3)	1m 13s
Test Core (1/3)	5m 41s
Build Core	58s
Dogfood Regression Gate (1/3)	3m 26s
Console Pin Gate	0s
Build Docs	0s
Dogfood Regression Gate	13s
Test Core	13s
	25m 12s

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