So which file are you having trouble with? I opened your MP2015.dotm & Normal.dotm files and can see nothing special about them - your Normal.dotm doesn't even contain any code. Indeed I can't even see how those files might be related to what's in this thread. I also opened your Brev.docm file and can see that, apart from your Document_New macro needing the same kind of changes made for the userform, it seems to work OK. Presumably, it too should be saved as a template; otherwise your Document_New macro will never run.
Code:
Private Sub Document_New()
Call UpdateBookmark("DagsDato", Format(Date, " dd. mmmm yyyy"))
UserForm1.Show
End Sub
Sub UpdateBookmark(StrBkMk As String, StrTxt As String)
Dim BkMkRng As Range
With ActiveDocument
If .Bookmarks.Exists(StrBkMk) Then
Set BkMkRng = .Bookmarks(StrBkMk).Range
BkMkRng.Text = StrTxt
.Bookmarks.Add StrBkMk, BkMkRng
End If
End With
Set BkMkRng = Nothing
End Sub