Revert "Add messages for the "named" user group"

This reverts commit 0995e06.

Reason for revert: The "named" group was removed in
I06bd5d7150203bbcb0806868fe829a438af486ba

Bug: T355741
Change-Id: I898470de4416e8e9d59901641767a4457648238b

languages/i18n/en.json

@@ -1133,7 +1133,6 @@
  "userrights-conflict": "Conflict of user rights changes! Please review and confirm your changes.",
  "group": "Group:",
  "group-user": "Users",
- "group-named": "Registered users",
  "group-temp": "Temporary users",
  "group-autoconfirmed": "Autoconfirmed users",
  "group-bot": "Bots",
@@ -1152,7 +1151,6 @@
  "group-bureaucrat-member": "{{GENDER:$1|bureaucrat}}",
  "group-suppress-member": "{{GENDER:$1|suppressor}}",
  "grouppage-user": "{{ns:project}}:Users",
- "grouppage-named": "{{ns:project}}:Registered users",
  "grouppage-temp": "{{ns:project}}:Temporary users",
  "grouppage-autoconfirmed": "{{ns:project}}:Autoconfirmed users",
  "grouppage-bot": "{{ns:project}}:Bots",

languages/i18n/qqq.json

@@ -1395,7 +1395,6 @@
  "userrights-conflict": "Shown on [[Special:UserRights]] if the target's rights have been changed since the form was loaded.",
  "group": "{{Identical|Group}}",
  "group-user": "{{doc-group|user}}\n{{Identical|User}}",
- "group-named": "{{doc-group|named}}\nThe name of the group that contains regular logged-in users, not including auto-created temporary users.",
  "group-temp": "{{doc-group|temp}}\nThe name of the group that contains auto-created temporary users.",
  "group-autoconfirmed": "{{doc-group|autoconfirmed}}\nOn Wikimedia sites, autoconfirmed users are users which are older than 4 days. After those 4 days, they have more rights.",
  "group-bot": "{{doc-group|bot}}\n{{Identical|Bot}}",
@@ -1414,7 +1413,6 @@
  "group-bureaucrat-member": "{{doc-group|bureaucrat|member}}",
  "group-suppress-member": "{{doc-group|suppress|member}}\nThis is a member of the optional (disabled by default) user group, meant for the [[mw:RevisionDelete|RevisionDelete]] feature, to change the visibility of revisions through [[Special:RevisionDelete]].\n\n{{Identical|Suppress}}",
  "grouppage-user": "{{doc-group|user|page}}\n{{Identical|User}}",
- "grouppage-named": "{{doc-group|named|page}}",
  "grouppage-temp": "{{doc-group|temp|page}}",
  "grouppage-autoconfirmed": "{{doc-group|autoconfirmed|page}}",
  "grouppage-bot": "{{doc-group|bot|page}}\n{{Identical|Bot}}",