Add bulk selection UI controls (#840)

* Add bulk selection UI

* Handle bulk selection with Stimulus controller instead of session

* Update tests

* Remove stale routes

* Remove old system test helper methods

config/locales/views/transactions/en.yml

@@ -66,6 +66,8 @@ en:
       edit_categories: Edit categories
       edit_imports: Edit imports
       import: Import
+    index:
+      transaction: transaction
     merchants:
       create:
         success: New merchant created successfully

config/routes.rb

@@ -43,8 +43,6 @@ Rails.application.routes.draw do
 
   resources :transactions do
     collection do
-      match "search" => "transactions#search", via: %i[ get post ]
-
       scope module: :transactions, as: :transaction do
         resources :rows, only: %i[ show update ]