Fix crash on device linking failure

Signal/src/Loki/Onboarding/SeedVC.swift

@@ -306,9 +306,14 @@ final class SeedVC : OnboardingBaseViewController, DeviceLinkingModalDelegate, O
                 let linkingRequestMessage = DeviceLinkingUtilities.getLinkingRequestMessage(for: masterHexEncodedPublicKey)
                 ThreadUtil.enqueue(linkingRequestMessage)
             }.catch(on: DispatchQueue.main) { [weak self] _ in
+                DispatchQueue.main.async {
+                    // FIXME: For some reason resetForRegistration() complains about not being on the main queue
+                    // without this (even though the catch closure should be executed on the main queue)
                     TSAccountManager.sharedInstance().resetForReregistration()
+                }
                 guard let self = self else { return }
                 let alert = UIAlertController(title: NSLocalizedString("Couldn't Link Device", comment: ""), message: NSLocalizedString("Please check your internet connection and try again", comment: ""), preferredStyle: .alert)
+                alert.addAction(UIAlertAction(title: "OK", accessibilityIdentifier: nil, style: .default, handler: nil))
                 self.present(alert, animated: true, completion: nil)
                 self.setUserInteractionEnabled(true)
             }

Signal/translations/en.lproj/Localizable.strings

@@ -2670,3 +2670,4 @@
 "Please check your internet connection and try again" = "Please check your internet connection and try again";
 "Device Unlinked" = "Device Unlinked";
 "Your device was unlinked successfully" = "Your device was unlinked successfully";
+"Unnamed Device" = "Unnamed Device";

SignalServiceKit/src/Loki/API/Multi Device/DeviceLink.swift

@@ -21,7 +21,7 @@ public final class DeviceLink : NSObject, NSCoding {
             if let customDisplayName = UserDefaults.standard.string(forKey: "\(hexEncodedPublicKey)_display_name") {
                 return customDisplayName
             } else {
-                return Mnemonic.encode(hexEncodedString: hexEncodedPublicKey.removing05PrefixIfNeeded()).split(separator: " ")[0..<3].joined(separator: " ")
+                return NSLocalizedString("Unnamed Device", comment: "")
             }
         }