YITH WooCommerce Badge Management Premium 3.12.0

New: support for WordPress 5.7
New: support for WooCommerce 5.1
New: Greek translation
New: German translation
New: German (Formal) translation
Update: YITH plugin framework
Update: language files

* New: support for WooCommerce 5.0
* Update: YITH plugin framework
* Update: language files
* Fix: badge settings layout on mobile
* Dev: added yith_wcbm_advanced_badge_product_price filter
* Dev: added yith_wcbm_advanced_badge_variation_price filter
* Dev: added yith_wcbm_advanced_badge_product_regular_price filter
* Dev: added yith_wcbm_advanced_badge_variation_regular_price filter
* Dev: added yith_wcbm_image_badge_alt_text filter

* New: support for WooCommerce 4.9
* Update: plugin framework
* Update: language files
* Fix: support for YITH WooCommerce Dynamic Pricing and Discounts