DALLAS — Hungary’s autocratic Prime Minister Viktor Orban urged cheering American conservatives on Thursday to ‘take back the institutions,’ stick to hardline stances on gay rights and immigration and fight for the next U.S. presidential election as a pivotal moment for their beliefs.The exuberant cheers and standing ovations at the Conservative Political Action Conference for the far-right prime minister, who has been criticized for undermining his own country’s democratic institutions, demonstrated the growing embrace between Orban and Republicans in the U.