Improves updateSync: connect to paypal only once.
Merging with actual core and resolving conflicts.
Fixes ordering of products.
Show service cost only if its price is greater than 0.
Fixes paypalurl in frontend and summary order of items in paypal.
Adding translation.
Merge https://github.com/Arcavias/arcavias-core into 2013-05-29_Reducing_UpdateSync_In_PayPal
Fixes output in paypal overview and adds translation in paypalexpress
Merge pull request #199 from doleiynyk/2013-05-29_Reducing_UpdateSync_In_PayPal

Reduces requests in updateSync() for PayPal and improves output shown on PayPal