Add 'tag deleted successfully' flash message

app/controllers/changeset_tags_controller.rb

@@ -34,6 +34,7 @@ class ChangesetTagsController < ApplicationController
     end
 
     @changeset_tag.delete
+    flash[:notice] = t ".success", :k => @changeset_tag.k, :v => @changeset_tag.v
     redirect_to changeset_tags_path(@changeset)
   end
 end

config/locales/en.yml

@@ -489,6 +489,8 @@ en:
     tag_not_found:
       heading: Changeset tag does not exist
       body: "Sorry, tag %{k} could not be found in changeset #%{id}."
+    destroy:
+      success: Tag %{k}=%{v} deleted successfully.
   changesets:
     changeset:
       no_edits: "(no edits)"

test/controllers/changeset_tags_controller_test.rb

@@ -124,6 +124,7 @@ class ChangesetTagsControllerTest < ActionDispatch::IntegrationTest
       assert_redirected_to changeset_tags_path(changeset)
     end
     assert_equal({ "tested-2nd-tag-key" => "tested-2nd-tag-value" }, changeset.tags)
+    assert_match(/tested-1st-tag-key=tested-1st-tag-value deleted successfully/, flash[:notice])
   end
 
   def test_destroy_success_empty_tag