UnityEditor.LocalizationDatabase sealed causing uTransformEditor.cs to break

I just updated to Unity 2017.3 and I immediately got this error after opening an ongoing Collab project

Assets/Editor/uEditor/Editor/uTransformEditor.cs(227,16): error CS0122: `UnityEditor.LocalizationDatabase’ is inaccessible due to its protection level

I have no idea how to fix this, please help.

The issue isn’t that the class is sealed but that its access modifier has been changed from public to internal. Unfortunately at this time I don’t have a good alternative solution for you. I suggest removing the localization call if it is not needed.