could it be, that this one is wrong in lang_blocks.php
$lang['cms_var_md_num_top_downloads'] = 'Number of top downloads displayed';
$lang['cms_var_md_num_top_downloads'] = 'Top Downloads';
$lang['cms_var_md_num_top_downloads_explain'] = '';
$lang['cms_var_md_num_top_downloads_explain'] = 'Number of top downloads displayed';
$lang['cms_var_md_num_top_downloads'] = 'Top Downloads';
$lang['cms_var_md_num_top_downloads_explain'] = '';
$lang['cms_var_md_num_top_downloads_explain'] = 'Number of top downloads displayed';
For me it looks creasy, but maybe it could be right
OPEN lang_blocks.php
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I will attache this english files with the little modifications if I have checked all