Apple Watch 应用程序无法本地化

我已经为德语、法语、西班牙语和简体中文设置了 interface.storyboard 字符串。我下载了 iOS 应用程序并将其加载到手表上。例如，我然后将手表语言设置为德语。但用户界面仍然是英文。

以下是 interface.storyboard 字符串：

    /* Class = "WKInterfaceButton"; title = "Start Timer"; ObjectID = "1oP-Ed-sIA"; */
"1oP-Ed-sIA.title" = "Timer starten";

/* Class = "WKInterfaceButton"; title = "0:30"; ObjectID = "Kti-O4-Ky6"; */
"Kti-O4-Ky6.title" = "0:30";

/* Class = "WKInterfaceDate"; format = " h:mm:ss a"; ObjectID = "P50-YW-9sa"; */
"P50-YW-9sa.format" = " h:mm:ss a";

/* Class = "WKInterfaceButton"; title = "0:15"; ObjectID = "QLq-vX-zHG"; */
"QLq-vX-zHG.title" = "0:15";

/* Class = "WKInterfaceButton"; title = "Do Not Disturb"; ObjectID = "Zku-u8-rhy"; */
"Zku-u8-rhy.title" = "Bitte nicht stören";

/* Class = "WKInterfaceButton"; title = "Stop Timer"; ObjectID = "afW-nF-dFL"; */
"afW-nF-dFL.title" = "Stoppuhr";

/* Class = "WKInterfaceButton"; title = "0:60"; ObjectID = "tDV-Bi-XDn"; */
"tDV-Bi-XDn.title" = "0:60";

这是手表截图：

我发现必须在本地化字符串设置“目标成员身份”下选择监视目标和监视扩展目标。我不知道为什么，因为据说只有在存在影响 UI 而不仅仅是故事板的代码时才需要本地化扩展。但这样做确实可以本地化手表 UI。