Homepage shows posts in both languages

I have index.php

There is query_posts at the start of the code

<?php global $theme; get_header(); ?>

    <div id="main">
    <?php $theme->hook('main_before'); ?>

        <div id="wrap-content">
        <?php $theme->hook('content_before'); ?>

            <div class="content">
                <?php
                    if(is_home()) {
                        $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
                        $build_homepage_query = array (
                		   'paged'=> $paged,
                		   'category__not_in' => $theme->get_option('homepage_exclude_categories'),
                           'posts_per_page' => $theme->get_option('homepage_posts_per_page')
                		);
                        query_posts($build_homepage_query);
                    }

                    $theme->options['template_part'] = 'homepage';
                    get_template_part('loop', 'homepage');
                ?>
            </div><!-- .content -->

        <?php $theme->hook('content_after'); ?>
        </div><!-- #wrap-content -->

        <?php get_sidebar(); ?> 

    <?php $theme->hook('main_after'); ?>
    </div><!-- #main -->

<?php get_footer(); ?>

I posted on their support forum yesterday, but haven’t got an answer yet. Probably I should wait after New Year holidays are over.

I am not 100% sure it is the only reason of the conflict with Polylang, but here your theme does not care of what is in the query and create its own new query, completeley overwriting what could be done by plugins.

Could you add this line

$build_homepage_query = array_merge($GLOBALS['wp_query']->query_vars, $build_homepage_query); // don't reset other query_vars!

just above:

query_posts($build_homepage_query);

Hey, it worked! Now the site is back to normal. Thank you!

So, this is now resolved. Thanks again and happy New Year, Chouby.

Great! You should suggest to the theme developper to include the modification in the next theme update as it will likely break other plugins. Happy New Year to you too!