Translate the attributes prefixed with _html to keep the html markup.

lib/simple_form/inputs/base.rb

@@ -178,10 +178,14 @@ module SimpleForm
           model_names.shift
 
           lookups << :"#{joined_model_names}.#{lookup_action}.#{reflection_or_attribute_name}"
+          lookups << :"#{joined_model_names}.#{lookup_action}.#{reflection_or_attribute_name}_html"
           lookups << :"#{joined_model_names}.#{reflection_or_attribute_name}"
+          lookups << :"#{joined_model_names}.#{reflection_or_attribute_name}_html"
         end
         lookups << :"defaults.#{lookup_action}.#{reflection_or_attribute_name}"
+        lookups << :"defaults.#{lookup_action}.#{reflection_or_attribute_name}_html"
         lookups << :"defaults.#{reflection_or_attribute_name}"
+        lookups << :"defaults.#{reflection_or_attribute_name}_html"
         lookups << default
 
         t(lookups.shift, scope: :"#{i18n_scope}.#{namespace}", default: lookups).presence

test/inputs/string_input_test.rb

@@ -115,6 +115,15 @@ class StringInputTest < ActionView::TestCase
     end
   end
 
+  test 'input should translate a key prefixed with _html and return the html markup' do
+    store_translations(:en, simple_form: { labels: { user: {
+      name_html: '<b>Name</b>'
+    } } }) do
+      with_input_for @user, :name, :string
+      assert_select 'label b', 'Name'
+    end
+  end
+
   [:email, :url, :search, :tel].each do |type|
     test "input should allow type #{type}" do
       with_input_for @user, :name, type