Fixed an issue where site file management was not create on portal import

Closes #6874

It appears that the normal localization fallback is in fact being used so if a language pack is missing some localized page names or anythin else, it does fallback to the english provided localization.

The crux of the issue is that for historical reasons "Admin" is a special page that needs too keep that specific name, we can localize the title but we need to keep that exact name. By changing parents to Admin in the templates, it appears to fix the issue reported.

Also supercedes #6939

Author: valadas

DNN Platform/Website/Portals/_default/Blank Website.template

@@ -2766,7 +2766,7 @@
       <sitemappriority>0.5</sitemappriority>
       <skinsrc />
       <startdate>0001-01-01T00:00:00</startdate>
-      <name>[Tab.WebsiteAdministration.Name.Text]</name>
+      <name>Admin</name>
       <title>[Tab.WebsiteAdministration.Title.Text]</title>
       <url type="Normal" />
       <tabpermissions>

DNN Platform/Website/Portals/_default/Default Website.template

@@ -3176,7 +3176,7 @@
       <sitemappriority>0.5</sitemappriority>
       <skinsrc />
       <startdate>0001-01-01T00:00:00</startdate>
-      <name>[Tab.WebsiteAdministration.Name.Text]</name>
+      <name>Admin</name>
       <title>[Tab.WebsiteAdministration.Title.Text]</title>
       <url type="Normal" />
       <tabpermissions>