some refactoring of invoice printing code
Add support to overwrite an existing invoice
Add support to print an invoice directly from the invoice edit page
Merge branch 'shineisp/sandbox'
Renamed method
Set order status to complete if all items inside orders are completed
Email English translation created by Rein Gramsma. (Thanks Rein)
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Email localization updated
Default sample data updated
Customers have the default language set using the language_id
Merge pull request #127 from guestisp/master

Pull request to sync the code
Now the customers will be saved with the language selection
Merge pull request #128 from shinesoftware/sandbox

Sandbox to Master