Persist UI settings, add missing localizations for German

db/migrate/20170109120109_create_web_settings.rb

@@ -0,0 +1,12 @@
+class CreateWebSettings < ActiveRecord::Migration[5.0]
+  def change
+    create_table :web_settings do |t|
+      t.integer :user_id
+      t.json :data
+
+      t.timestamps
+    end
+
+    add_index :web_settings, :user_id, unique: true
+  end
+end