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Fixes #6

switch statements in PHP with mixed types lead to wrong results... => explicitly check for string before the switch

Don't print error message for unknown variables, because the invoice numbers don't have the customer info available

Make it work with PHP 5.3 (does not support function return values as array references: functioncall()['key'])

Implement counter changing; UI for custom variables; fix translations; update code to the new set of config fields