Simplify localization code, remove extension

Sources/Localization.swift

@@ -1,36 +1,34 @@
 import Foundation
 
-extension Bundle {
-    static var localizationBundle: Bundle {
-        // When installed via the Swift Package Manager, the bundle name is "CalendarKit_CalendarKit",
-        // via CocoaPods - "CalendarKit"
-        let bundleNames = ["CalendarKit_CalendarKit", "CalendarKit"]
-
-        let candidates = [
-            // Bundle should be present here when the package is linked into an App.
-            Bundle.main.resourceURL,
-
-            // Bundle should be present here when the package is linked into a framework.
-            Bundle(for: DayViewController.self).resourceURL,
-
-            // For command-line tools.
-            Bundle.main.bundleURL,
-        ]
-
-        for candidate in candidates {
-            for bundleName in bundleNames {
-                let bundlePath = candidate?.appendingPathComponent(bundleName + ".bundle")
-                if let bundle = bundlePath.flatMap(Bundle.init(url:)) {
-                    return bundle
-                }
+func localizedString(_ key: String) -> String {
+    var localizationBundle = Bundle.main
+    // When installed via the Swift Package Manager, the bundle name is "CalendarKit_CalendarKit",
+    // via CocoaPods - "CalendarKit"
+    let bundleNames = ["CalendarKit_CalendarKit", "CalendarKit"]
+
+    let candidates = [
+        // Bundle should be present here when the package is linked into an App.
+        Bundle.main.resourceURL,
+
+        // Bundle should be present here when the package is linked into a framework.
+        Bundle(for: DayViewController.self).resourceURL,
+
+        // For command-line tools.
+        Bundle.main.bundleURL,
+    ]
+
+outer:
+    for candidate in candidates {
+        for bundleName in bundleNames {
+            let bundlePath = candidate?.appendingPathComponent(bundleName + ".bundle")
+            if let bundle = bundlePath.flatMap(Bundle.init(url:)) {
+                localizationBundle = bundle
+                break outer
             }
         }
-        return Bundle.main
     }
-}
 
-func localizedString(_ key: String) -> String {
-    Bundle.localizationBundle.localizedString(forKey: key,
+    return localizationBundle.localizedString(forKey: key,
                                               value: nil,
                                               table: nil)
 }