[Timo972]

Problem

/broadcast/start finds the system confirmation sheet's button by its English label ("Start Broadcast", falling back to any button whose label begins with "Start"). It finds the stale "Screen Broadcasting" alert by "OK" / "Go to Application". When the device's system language isn't English, neither lookup matches. In German, for example, the button reads "Übertragung starten". The start then times out, unless the caller passes the localized labels explicitly.

Fix

ReplayKit ships these strings in every language iOS supports:

UI element	ReplayKit key
Confirm button	CONTROL_CENTER_START_BROADCAST
Alert dismiss button	BROADCAST_FAILED_ALERT_OK_BUTTON
Alert "Go to Application" button	BROADCAST_FAILED_ALERT_GO_TO_APP_BUTTON

• +[FBBroadcastManager replayKitLabelsForKey:] reads a key from ReplayKit's Localizable.strings in all of its localizations. The device's preferred localizations come first. A .loctable layout is also handled. The result is cached per key.
• Matching uses every language, not only the current one. The system UI can be rendered in a different language than the runner's own preferences (e.g. a per-app language override), and each localization's string is distinct UI text.
• The confirm button is now found with a single label IN %@ query per app, instead of one existence probe per label. The English "Start" prefix match stays as a last resort.
• The alert is still identified structurally: exactly two buttons, one matching the dismiss labels and the other matching the go-to-application labels.
• confirmButtonLabels, dismissButtonLabels and goToApplicationButtonLabels are now matched in addition to the system labels instead of replacing them. Existing callers keep working.
• docs/broadcast-extension.md is updated to match.

Testing

• New FBBroadcastLabelsTests (UnitTests, iOS Simulator) checks that the English, German, Chinese and Turkish labels resolve, and that an unknown key yields an empty list. All three tests pass.
• WebDriverAgentLib builds for generic/platform=iOS with no new warnings.
• Not yet verified end to end on a physical device with a non-English system language.

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