feat(app): Add getAppLanguage #5660

Job	Run time
setup (macos-15)	38s
setup (ubuntu-latest)	31s
lint-scripts	54s
lint (app)	44s
verify-ios (/Applications/Xcode_26.0.app, app)	2m 9s
verify-web (app)	22s
verify-android (app)	1m 48s
	7m 6s

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