It is often helpful to update the Group Policy templates for a domain. The most current set can be found quite easily via a Google search:

https://www.google.com/search?q=Administrative+Templates+%28.admx%29+for+Windows+10&ie=utf-8&oe=utf-8&client=firefox-b-1-ab

They install as an MSI which does nothing but dump them into a folder here:

 C:\Program Files (x86)\Microsoft Group Policy

Once you have the above done, we have manual steps. The best way to approach this is probably in an administrative CMD.

First, look in here:

%WINDIR%\PolicyDefinitions

We will be wiping everything there. If there are many files with numbers at the end of their names, you probably have Microsoft Office templates as well as Windows templates, and you will have to replace them too. There are other templates which could be involved, so be warned and be ready.

For now, we are going to write as if you have just Microsoft default templates there. Wipe them all. Then replace them with all of the .ADMX files in the dump folder, plus just the language folder appropriate for you. The dump folder will have all of the language folders, you want just yours.

The second destination folder is:

\\<localdomain>\SYSVOL\<localdomain>\policies\PolicyDefinitions

where is the name of the Windows domain. If the folder does not exist, create it, this is creation of your Central Store. If the folder does exist, replace them as above.