Using the official unity localization package, version 1.2.1, in Unity Editor version 2019.4.31f.
Localization works fine in the Editor, however when running as a standalone build, none of the strings are localized, and in fact, appear to be causing some sort of error (program misbehaves).
Error Log snippet:
Addressables - Unable to load runtime data at location UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle1[[UnityEngine.AddressableAssets.Initialization.ResourceManagerRuntimeData, Unity.Addressables, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]. UnityEngine.StackTraceUtility:ExtractStackTrace () (at C:/buildslave/unity/build/Runtime/Export/Scripting/StackTrace.cs:37) ...