Translation not taking effect

Hi,

I am still getting in english these lines:

Sign in with Twitter

Sign in with Facebook

All other strings were transltated sucessfully.

How could I fix that?

Url for reference:
http://www.brahmsoftware.com/clients/caminhosdazonasul/2014/07/tecon-rio-grande-movimenta-cargas-da-foton-caminhoes/

Thanks in advance.

https://ww.wp.xz.cn/plugins/social/