Merge pull request #14770 from crazymykl/avoid_dos_vuln_in_i18n_guide

Avoid suggesting dangerous code in i18n guide

guides/source/i18n.md

@@ -179,7 +179,7 @@ end
 # in your /etc/hosts file to try this out locally
 def extract_locale_from_tld
   parsed_locale = request.host.split('.').last
-  I18n.available_locales.include?(parsed_locale.to_sym) ? parsed_locale : nil
+  I18n.available_locales.map(&:to_s).include?(parsed_locale) ? parsed_locale : nil
 end
 ```
 
@@ -192,7 +192,7 @@ We can also set the locale from the _subdomain_ in a very similar way:
 # in your /etc/hosts file to try this out locally
 def extract_locale_from_subdomain
   parsed_locale = request.subdomains.first
-  I18n.available_locales.include?(parsed_locale.to_sym) ? parsed_locale : nil
+  I18n.available_locales.map(&:to_s).include?(parsed_locale) ? parsed_locale : nil
 end
 ```