Some fixes for Czech translation

* Close HTML tags correctly
* Fix the plural forms expression
* Remove excess placeholder
Merge pull request #3943 from SergeyBiryukov/master

Some fixes for Czech translation
fixing norwegian typo with {order_date}
Refactor coupon code so coupons get the actual discount amount, redone edit coupon screen with tabs, added coupon item limits which Closes #3902
Merge pull request #3947 from BFTrick/fix-norwegian-translation-master

Fixing Norwegian Typo on Master
CH postcode validation
Merge pull request #1 from woothemes/master

Update