Add model, controller, view and routes for excel importer.
Renerate controller with correct name.
Add ActiveModel properites to enable form_for use
Create excel template for users to download
Importer view and styling
New action creates blank instance of excelImport
Validate presence of file, use to redirect to new if nothing uploaded.
Validate correct file extension
Fix excel file strong param
Working on record saving
Importer builds term record objects
Pass user to importer instantiation
Add show view and display saved and failed records in tables.
Different language field validation handling if in importer collection
Fix typo
Use pluralize in headings
Detect collection langs from first row
Make import fail unless all rows succeed. Make partial for import failure.
Add style to hide edit links on import preview records
Add view partial for successful import