use translation in helpers.label

lib/bootstrap_forms/helpers/wrappers.rb

@@ -41,7 +41,26 @@ def error_string
       end
 
       def human_attribute_name
-        object.class.human_attribute_name(@name) rescue @name.to_s.titleize
+        object_name = @object_name.to_s.dup
+
+        # Copied from https://github.com/rails/rails/blob/fb24f419051aec00790a8e6fb5785eeb6f503f4a/actionpack/lib/action_view/helpers/tags/label.rb#L38
+        object_name.gsub!(/\[(.*)_attributes\]\[\d\]/, '.\1')
+        method = @name.to_s
+        if object.respond_to?(:to_model)
+          key = object.class.model_name.i18n_key
+          i18n_default = ["#{key}.#{method}".to_sym, ""]
+        end
+
+        i18n_default ||= ""
+        result = I18n.t("#{object_name}.#{method}", :default => i18n_default, :scope => "helpers.label").presence
+
+        result ||= if object && object.class.respond_to?(:human_attribute_name)
+          object.class.human_attribute_name(method)
+        end
+
+        result ||= method.humanize
+
+        result
       end
 
       def input_div(&block)

spec/support/shared_context.rb

@@ -56,6 +56,14 @@
       it 'allows symbol as field name' do
         @builder.check_box(:name).should == @builder.check_box('name')
       end
+
+      context "with helper translations" do
+        before(:all) { I18n.backend.store_translations I18n.locale, {:helpers => {:label => {"item" => {"name" => "name translation"}}}} }
+        after(:all)  { I18n.backend.reload! }
+        it 'uses helper translation' do
+          @builder.check_box(:name).should include("name translation")
+        end
+      end
     end
 
     describe 'radio_buttons' do