Render the dashboard in apps that don't make English available

README.md

@@ -412,6 +412,11 @@ You can always take control of the views by creating your own views and/or parti
 </html>
 ```
 
+
+### Locales
+
+The dashboard is written in English and renders in English whenever your app allows the `:en` locale. If `config.i18n.available_locales` leaves out `:en`, the dashboard renders in your app's locale instead, and you will need to provide the `datetime.distance_in_words.short` translations from [`config/locales/en.yml`](config/locales/en.yml) in that locale.
+
 ## Sponsors
 
 <p align="center">

app/controllers/solid_errors/errors_controller.rb

@@ -1,6 +1,6 @@
 module SolidErrors
   class ErrorsController < ApplicationController
-    around_action :force_english_locale!
+    around_action :use_english_when_available
 
     before_action :set_error, only: %i[show update destroy]
 
@@ -53,7 +53,10 @@ def set_error
       @error = Error.find(params[:id])
     end
 
-    def force_english_locale!(&action)
+    # The dashboard's strings ship in English only; apps that don't allow :en keep their own locale
+    def use_english_when_available(&action)
+      return action.call unless I18n.locale_available?(:en)
+
       I18n.with_locale(:en, &action)
     end
 

test/controllers/solid_errors/errors_controller_test.rb

@@ -85,6 +85,22 @@ class SolidErrors::ErrorsControllerTest < ActionDispatch::IntegrationTest
     assert_select "main a[href='/']", text: "← Back to main app"
   end
 
+  test "the dashboard renders in apps that do not make English available" do
+    available_locales, default_locale, locale = I18n.available_locales, I18n.default_locale, I18n.locale
+    I18n.available_locales = [:fr]
+    I18n.default_locale = I18n.locale = :fr
+
+    get solid_errors.errors_path
+    assert_response :success
+
+    get solid_errors.error_path(@error)
+    assert_response :success
+  ensure
+    I18n.available_locales = available_locales
+    I18n.default_locale = default_locale
+    I18n.locale = locale
+  end
+
   private
 
   def report_errors(count)