# local resources directory
src/Resources/
# still works this path for templates
src/Resources/views/

# override resources from third-party bundles
src/Resources/{AcmeThirdPartyBundle}/views/ # for override templates
src/Resources/{AcmeThirdPartyBundle}/translations/ # for override both translations and validations files
src/Resources/{AcmeThirdPartyBundle}/... # etc.

# config.yml
twig:
    paths:
        templates: ~
        templates/bundles/AcmeThirdPartyBundle: AcmeThirdParty
        vendor/acme/third-party-bundle/Resources/views: AcmeThirdParty
        # etc.