Uttaranchal (UT) renamed to Uttarakhand (UK)

Issue: https://github.com/woothemes/woocommerce/issues/5448
Update class-wc-meta-box-coupon-data.php

Introduce `woocommerce_coupon_data_panels` action.

If someone wants to add a new tab to the Coupons data meta box, they can use the `woocommerce_coupon_data_tabs` filter to register a new tab. These tabs accept a `target` key that lets you specify the `div` ID to reveal when the tab is clicked on. It turns out, however, that there is no way to actually add the `div` to the page, making the filter for custom tabs only good for removing tabs.
fixed WC_Product_Variable::set_stock() compatibility with WC_Product::set_stock()
Check if term is returned before getting its name

Prevents a rare notice if the order item meta value is blank
Merge pull request #5449 from mkrdip/patch-2

Uttaranchal (UT) renamed to Uttarakhand (UK)
Fix notice when not scanning any files Closes #5465
Merge pull request #5464 from tamarazuk/master

Order Item Meta - Check if attribute term exists
Merge pull request #5460 from claudiosmweb/fix-strict-standards-set-stock

Fix WC_Product_Variable::set_stock() compatibility with WC_Product::set_stock()
fixed some coding standards in includes/class-wc-ajax.php
Made wc_get_product_terms support custom menu_order by using get_terms and an include

Fixes #5455
Merge pull request #5466 from claudiosmweb/improve-ajax-class

Fix some coding standards in includes/class-wc-ajax.php
Merge pull request #5458 from pippinsplugins/master

Update class-wc-meta-box-coupon-data.php
Add a tip for default selections, and use opt groups for the long bulk edit list
Ensure _stock meta exists, or update will fail
normalized the woocommerce_email_attachments filter return type
Merge pull request #5469 from claudiosmweb/normalize-woocommerce_email_attachments-filter-type

Normalize the woocommerce_email_attachments filter return type
Update class-wc-validation.php

Correct character 3 vaildation
Merge pull request #5478 from ChromeOrange/master

Update class-wc-validation.php
[2.2] Respect login hidden toggle Fixes #5479
Merge branch '2.1'

Conflicts:
i18n/languages/woocommerce-admin.pot
i18n/languages/woocommerce.pot
package.json
readme.txt
woocommerce.php