use wooocommerce_locate_template

This allows woocommerce_locate_template filter to work on admin also
Define line_subtotal and line_subtotal_tax to avoid PHP notice in cart.
Use global $current_user in my-account/edit address.

Avoid PHP notice for undefined variable.
Use wp_nonce_field. $woocommerce->nonce_field is deprecated.
woocommerce_exclude_order_comments() is now exclude_order_comments()
Massive BG language update

Language update for 2.1.
Updated catalog
Removed some states translations that are not so correct.
Updated some strings to look nicer on UI
Rename attributes class to woocommerce_attributes. Fixes #4019

.product_attributes should be .woocommerce_attributes
Remove placeholder polyfill. closes #4012
readme
Replaced &rarr; / &larr; on frontend with icons from our font. closes #4009
Add review form no longer opens in lightbox. closes #3804
edit coupon icons and new version of WooCommerce icon font. #3585
_woocommerce_term_recount
Merge pull request #4018 from dimitrov-adrian/patch-7

Massive BG language update
Merge pull request #4017 from scottbasgaard/master

Define line_subtotal and line_subtotal_tax to avoid PHP notice in cart.
Merge remote-tracking branch 'upstream/master'
replace function with new filter
Merge pull request #4015 from RistoNiinemets/master

use wooocommerce_locate_template
Update estonina translation
woocommerce_apply_base_tax_for_local_pickup when no methods are chosen yet