Persist UI settings, add missing localizations for German

app/models/account.rb

@@ -104,7 +104,7 @@ class Account < ApplicationRecord
   end
 
   def subscribed?
-    subscription_expires_at
+    !subscription_expires_at.blank?
   end
 
   def favourited?(status)
@@ -189,7 +189,7 @@ class Account < ApplicationRecord
     def requested_map(target_account_ids, account_id)
       follow_mapping(FollowRequest.where(target_account_id: target_account_ids, account_id: account_id), :target_account_id)
     end
-    
+
     private
 
     def follow_mapping(query, field)

app/models/web.rb

@@ -0,0 +1,5 @@
+module Web
+  def self.table_name_prefix
+    'web_'
+  end
+end

app/models/web/setting.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class Web::Setting < ApplicationRecord
+  belongs_to :user
+
+  validates :user, uniqueness: true
+end