Fixed the usage of ternary operator in Amazon US.
Loads the correct language file in Amazon modules.
Removed throw statement in the mysqli driver.
Merge branch 'v1.5.6.x' of https://github.com/opencart/opencart into opencart/v1.5.6.x
Merge pull request #1472 from Martynas-P/v1.5.6.x

Fixed the usage of ternary operator in Amazon US.