Sanitize translations instead of using _html

Using the `_html` suffix in an i18n key is the same as using `html_safe`
on it, which means that translation could potentially be used for XSS
attacks.

app/helpers/globalize_helper.rb

@@ -64,7 +64,7 @@ module GlobalizeHelper
   end
 
   def selected_languages_description(resource)
-    t("shared.translations.languages_in_use_html", count: active_languages_count(resource))
+    sanitize(t("shared.translations.languages_in_use", count: active_languages_count(resource)))
   end
 
   def select_language_error(resource)