Change followers page to relationships page in admin UI (#12927)

Allow browsing and filtering all relationships instead of just
followers, unify the codebase with the user-facing relationship
manager, add ability to see who the user invited

app/views/admin/accounts/show.html.haml

@@ -41,7 +41,7 @@
       .dashboard__counters__num= number_to_human_size @account.media_attachments.sum('file_file_size')
       .dashboard__counters__label= t 'admin.accounts.media_attachments'
   %div
-    = link_to admin_account_followers_path(@account.id) do
+    = link_to admin_account_relationships_path(@account.id, location: 'local') do
       .dashboard__counters__num= number_with_delimiter @account.local_followers_count
       .dashboard__counters__label= t 'admin.accounts.followers'
   %div

app/views/admin/followers/index.html.haml

@@ -1,28 +0,0 @@
-- content_for :page_title do
-  = t('admin.followers.title', acct: @account.acct)
-
-.filters
-  .filter-subset
-    %strong= t('admin.accounts.location.title')
-    %ul
-      %li= link_to t('admin.accounts.location.local'), admin_account_followers_path(@account.id), class: 'selected'
-  .back-link{ style: 'flex: 1 1 auto; text-align: right' }
-    = link_to admin_account_path(@account.id) do
-      = fa_icon 'chevron-left fw'
-      = t('admin.followers.back_to_account')
-
-%hr.spacer/
-
-.table-wrapper
-  %table.table
-    %thead
-      %tr
-        %th= t('admin.accounts.username')
-        %th= t('admin.accounts.role')
-        %th= t('admin.accounts.most_recent_ip')
-        %th= t('admin.accounts.most_recent_activity')
-        %th
-    %tbody
-      = render partial: 'admin/accounts/account', collection: @followers
-
-= paginate @followers

app/views/admin/relationships/index.html.haml

@@ -0,0 +1,39 @@
+- content_for :page_title do
+  = t('admin.relationships.title', acct: @account.acct)
+
+.filters
+  .filter-subset
+    %strong= t 'relationships.relationship'
+    %ul
+      %li= filter_link_to t('relationships.following'), relationship: nil
+      %li= filter_link_to t('relationships.followers'), relationship: 'followed_by'
+      %li= filter_link_to t('relationships.mutual'), relationship: 'mutual'
+      %li= filter_link_to t('relationships.invited'), relationship: 'invited'
+
+  .filter-subset
+    %strong= t('admin.accounts.location.title')
+    %ul
+      %li= filter_link_to t('admin.accounts.moderation.all'), location: nil
+      %li= filter_link_to t('admin.accounts.location.local'), location: 'local'
+      %li= filter_link_to t('admin.accounts.location.remote'), location: 'remote'
+
+  .back-link{ style: 'flex: 1 1 auto; text-align: right' }
+    = link_to admin_account_path(@account.id) do
+      = fa_icon 'chevron-left fw'
+      = t('admin.statuses.back_to_account')
+
+%hr.spacer/
+
+.table-wrapper
+  %table.table
+    %thead
+      %tr
+        %th= t('admin.accounts.username')
+        %th= t('admin.accounts.role')
+        %th= t('admin.accounts.most_recent_ip')
+        %th= t('admin.accounts.most_recent_activity')
+        %th
+    %tbody
+      = render partial: 'admin/accounts/account', collection: @accounts
+
+= paginate @accounts