Merge "Legacy channels say "allow sound" instead of "let the app decide". We...

    <!-- [CHAR LIMIT=100] Notification importance screen title -->

    <string name="notification_importance_title">Importance</string>

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    <string name="notification_importance_unspecified">Let the app decide</string>

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    <string name="notification_importance_unspecified">Allow sound</string>

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    <string name="notification_importance_blocked">Never show notifications</string>