You either have to enable cookies or to add newlang=eng to every url on OFP.info.
Examples:
ofp.gamepark.cz/index.php
ofp.gamepark.cz/index.php?newlang=eng
ofp.gamepark.cz/index.php?special=articles/addons.html
ofp.gamepark.cz/index.php?newlang=eng&special=articles/addons.html
ofp.gamepark.cz/index.php?oblast=addons&search=predator
ofp.gamepark.cz/index.php?newlang=eng&oblast=addons&search=predator