Initial pass at Plaid EU (#1555)

* Initial pass at Plaid EU

* Add EU support to Plaid Items

* Lint

* Temp fix for rubocop isseus

* Merge cleanup

* Pass in region and get tests passing

* Use absolute path for translation

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Signed-off-by: Josh Pigford <josh@joshpigford.com>

test/controllers/plaid_items_controller_test.rb

@@ -21,6 +21,7 @@ class PlaidItemsControllerTest < ActionDispatch::IntegrationTest
       post plaid_items_url, params: {
         plaid_item: {
           public_token: public_token,
+          region: "us",
           metadata: { institution: { name: "Plaid Item Name" } }
         }
       }