Account namespace updates: part 4 (transfers, singular namespacing) (#896)

* Move Transfer to Account namespace

* Fix partial resolution due to namespacing plurality

* Make category and tag controllers consistent with namespacing convention

* Update stale partial reference

app/controllers/tag/deletions_controller.rb

@@ -0,0 +1,24 @@
+class Tag::DeletionsController < ApplicationController
+  layout "with_sidebar"
+
+  before_action :set_tag
+  before_action :set_replacement_tag, only: :create
+
+  def new
+  end
+
+  def create
+    @tag.replace_and_destroy! @replacement_tag
+    redirect_back_or_to tags_path, notice: t(".deleted")
+  end
+
+  private
+
+    def set_tag
+      @tag = Current.family.tags.find_by(id: params[:tag_id])
+    end
+
+    def set_replacement_tag
+      @replacement_tag = Current.family.tags.find_by(id: params[:replacement_tag_id])
+    end
+end