Remove / Undo Localisation

Hey, since it is not possivle to use localisation on Custom HTML Blocks I wanted to remove or undo the process but that is not possible it seems. 

Thats leaving me with a permanent side-tab where it wants me to continue with localisation and I cant update my shared Review-link and i have to generate a new one.

Why isnt it possible to abandon the localisation attempt and go back to normal?

Thanks in advance