A lot of mistakes messages after -> 3.0 update

A lot of mistakes messages appeared in debug.log after this update:

1. Duplicate key name ‘attribute_name – in DB for many tables in response to “ALTER TABLE”

2. woocommerce_get_page_id – deprecated

3. translations – broken, mistakes in languages files.

I returned site to previous version.
My PHP is 7.0

From debug.log after DB update (as WC required):

[05-Apr-2017 13:28:57 UTC] WordPress database error Duplicate key name ‘attribute_name’ for query ALTER TABLE wp_woocommerce_attribute_taxonomies ADD KEY attribute_name (attribute_name(20)) made by require_once(‘wp-admin/admin.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), WP_Hook->do_action, WP_Hook->apply_filters, WC_Install::check_version, WC_Install::install, WC_Install::create_tables, dbDelta
[05-Apr-2017 13:29:01 UTC] WordPress database error Duplicate key name ‘download_order_key_product’ for query ALTER TABLE wp_woocommerce_downloadable_product_permissions ADD KEY download_order_key_product (product_id,order_id,order_key(16),download_id) made by require_once(‘wp-admin/admin.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), WP_Hook->do_action, WP_Hook->apply_filters, WC_Install::check_version, WC_Install::install, WC_Install::create_tables, dbDelta
[05-Apr-2017 13:29:05 UTC] WordPress database error Duplicate key name ‘meta_key’ for query ALTER TABLE wp_woocommerce_order_itemmeta ADD KEY meta_key (meta_key(32)) made by require_once(‘wp-admin/admin.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), WP_Hook->do_action, WP_Hook->apply_filters, WC_Install::check_version, WC_Install::install, WC_Install::create_tables, dbDelta
[05-Apr-2017 13:29:11 UTC] WordPress database error Duplicate key name ‘tax_rate_state’ for query ALTER TABLE wp_woocommerce_tax_rates ADD KEY tax_rate_state (tax_rate_state(2)) made by require_once(‘wp-admin/admin.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), WP_Hook->do_action, WP_Hook->apply_filters, WC_Install::check_version, WC_Install::install, WC_Install::create_tables, dbDelta
[05-Apr-2017 13:29:11 UTC] WordPress database error Duplicate key name ‘tax_rate_class’ for query ALTER TABLE wp_woocommerce_tax_rates ADD KEY tax_rate_class (tax_rate_class(10)) made by require_once(‘wp-admin/admin.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), WP_Hook->do_action, WP_Hook->apply_filters, WC_Install::check_version, WC_Install::install, WC_Install::create_tables, dbDelta
[05-Apr-2017 13:29:14 UTC] WordPress database error Duplicate key name ‘location_type_code’ for query ALTER TABLE wp_woocommerce_tax_rate_locations ADD KEY location_type_code (location_type(10),location_code(20)) made by require_once(‘wp-admin/admin.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), WP_Hook->do_action, WP_Hook->apply_filters, WC_Install::check_version, WC_Install::install, WC_Install::create_tables, dbDelta
[05-Apr-2017 13:29:19 UTC] WordPress database error Duplicate key name ‘location_type_code’ for query ALTER TABLE wp_woocommerce_shipping_zone_locations ADD KEY location_type_code (location_type(10),location_code(20)) made by require_once(‘wp-admin/admin.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), WP_Hook->do_action, WP_Hook->apply_filters, WC_Install::check_version, WC_Install::install, WC_Install::create_tables, dbDelta
[05-Apr-2017 13:29:28 UTC] WordPress database error Duplicate key name ‘meta_key’ for query ALTER TABLE wp_woocommerce_payment_tokenmeta ADD KEY meta_key (meta_key(32)) made by require_once(‘wp-admin/admin.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), WP_Hook->do_action, WP_Hook->apply_filters, WC_Install::check_version, WC_Install::install, WC_Install::create_tables, dbDelta
[05-Apr-2017 13:29:31 UTC] PHP Notice: woocommerce_get_page_id is deprecated since version 3.0! Use wc_get_page_id instead. in …/wp-includes/functions.php on line 3829