3.4.5.2 (3.4.6 pre-release)

This is minor change, but still needs to be tested before the release. Mostly, it helps to integrate "Yoast SEO" plugin.

• Improvement: admin configuration loading is moved to filter 'plugins_loaded', search for function qtranxf_admin_load to see the change.
• Fix: removed meta box "Languages" in any Editor Mode, except "Single Language".