Total post count, (..$config['num_posts']), not showing on index. num_posts is in _config.
Support for arbitrary number of plural forms in language packs
Caused by TOTAL_POSTS vs TOTAL_POSTS_COUNT.
TOTAL_POSTS_OTHER in https://github.com/phpbb/phpbb3/pull/376/files#diff-0 looks fishy as well.
Resolved? by adjustment to language/en/common.php : 'TOTAL_POSTS' => 'Total posts <strong>%d</strong>',
TOTAL_POSTS_COUNT does not appear to be any use now?
Works quite fine on area51, is your translation up to date?
phpbb-phpbb3-release-3.0.10-1699-g23e845d.tar.gz and previous versions.
area51 is not up to date. Also, I already clearly pointed out what the problem is.