Improve error message whan importing CSV files with incorrect character encoding [SCI-815]

app/controllers/organizations_controller.rb

@@ -74,7 +74,8 @@ class OrganizationsController < ApplicationController
             end
           end
         rescue ArgumentError, CSV::MalformedCSVError
-          error = t("organizations.parse_sheet.errors.invalid_file")
+          error = t('organizations.parse_sheet.errors.invalid_file',
+                    encoding: ''.encoding)
           format.html {
             flash[:alert] = error
             redirect_to session.delete(:return_to)

config/locales/en.yml

@@ -922,7 +922,7 @@ en:
       import_samples: "Import samples"
       do_not_include_column: "Do not include this column"
       errors:
-        invalid_file: "The file you provided is invalid."
+        invalid_file: "The file you provided is invalid. Make sure the file is encoded using %{encoding}."
         invalid_extension: "The file has invalid extension."
         empty_file: "You've selected empty file. There's not much to import."
         temp_file_failure: "We couldn't create temporary file. Please contact administrator."