How to reproduce:
1. Create a new Unity project
2. Open the Package Manager (Window->Package Manager)
3. Install the Device Simulator Package (In the Package manager "+"->Add package from git URL..."->"com.unity.device-simulator"->Add)
4. Install the Localization Package (In the Package manager "+"->Add package from git URL..."->"com.unity.localization"->Add)
5. Open the Game view (Window->General->Game)
6. Switch the Game view to Simulator (top-right of the Game view "Game"->"Simulator")

Expected results: No errors are thrown
Actual results: "Failed instantiating Device Simulator legacy extension PackageLanguageMenu." error is thrown

Reproducible with: 3.0.0-preview, 3.0.2-preview (2019.4.32f1, 2020.3.21f1)
Not reproducible with: 2021.1.27f1, 2021.2.0b17, 2022.1.0a13
Could not test with: 2.2.4-preview (2019.4.32f1, 2020.3.2f1) and earlier because of the "NullReferenceError" when Simulator view is opened

Notes:
- The Device Simulator is not a package and is incorporated into the Editor starting 2021.1 version
- Full error:
Failed instantiating Device Simulator legacy extension PackageLanguageMenu.
UnityEngine.Debug:LogError (object)
Unity.DeviceSimulator.SimulatorExtensions:.ctor () (at Library/PackageCache/com.unity.device-simulator@3.0.2-preview/Editor/Scripting/DeviceSimulatorInterfaces.cs:47)
UnityEditor.EditorGUI/PopupCallbackInfo:SetEnumValueDelegate (object,string[],int)