How to force translate for Recommend and Share buttons?

Hello

Do you have suggestion how to force Croatian localization for FB buttons?

Take a look at this url:
www.trusty.hr/scena/knjige-i-mediji/22-p...a-za-ljeto-2014.html

In Firefox it is fully in English (as I have English FF version installed)
In IE its in both English and Croatian: Recommend and Share is in Croatian,
and text part is "bi-lingual: "Registriraj se / to see what your friends recommend."
I tried to add hr-HR in Facebook Language Locale Override setting in Facebook tab configuration, but it's still the same.
(I tried also other combinations: hr-HR hr-hr hr_hr hr_HR)

Website is in Croatian language only so I'd like that FB buttons stays Croatian as well

If I change Content button - Like > Verb to Display setting into "Like", than in IE, all buttons and text are fully translated,
but in FF it still stays in English.

(Chrome have same behavior like IE)

In joomla language settings, Croatian is set as default for frontend, and only Croatian language is set in Language Manager: Content Languages.
Language tag for Croatian language is hr-HR

Joomla 3.3.1
JFBC 6.0.6.
RocketTheme template

Regards