Add support to html markup in I18n options.

Closes #764.

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## master
 
 ### enhancements
+  * Add support to html markup in the I18n options. [@laurocaetano](https://github.com/laurocaetano)
   * Add the `full_error` component. [@laurocaetano](https://github.com/laurocaetano)
   * Add support to `scope` to be used on associations. [@laurocaetano](https://github.com/laurocaetano)
   * Execute the association `condition` in the object context. [@laurocaetano](https://github.com/laurocaetano)

lib/simple_form/inputs/collection_input.rb

@@ -100,7 +100,13 @@ module SimpleForm
       def translate_collection
         if translated_collection = translate_from_namespace(:options)
           @collection = collection.map do |key|
-            [translated_collection[key] || key, key.to_s]
+            html_key = "#{key}_html".to_sym
+
+            if translated_collection[html_key]
+              [translated_collection[html_key].html_safe || key, key.to_s]
+            else
+              [translated_collection[key] || key, key.to_s]
+            end
           end
           true
         end

test/inputs/collection_radio_buttons_input_test.rb

@@ -92,6 +92,20 @@ class CollectionRadioButtonsInputTest < ActionView::TestCase
     end
   end
 
+  test 'input should do automatic collection translation and preserve html markup' do
+    swap SimpleForm, boolean_style: :nested do
+      store_translations(:en, simple_form: { options: { user: {
+        gender: { male_html: '<strong>Male</strong>', female_html: '<strong>Female</strong>' }
+      } } } ) do
+        with_input_for @user, :gender, :radio_buttons, collection: [:male, :female]
+        assert_select 'input[type=radio][value=male]'
+        assert_select 'input[type=radio][value=female]'
+        assert_select 'label[for=user_gender_male]', 'Male'
+        assert_select 'label[for=user_gender_female]', 'Female'
+      end
+    end
+  end
+
   test 'input should mark the current radio value by default' do
     @user.name = "Carlos"
     with_input_for @user, :name, :radio_buttons, collection: ['Jose', 'Carlos']