Partial fix for EXT-5986 ([HARD CODED]. "You paid ...... L$... " - message...

Partial fix for EXT-5986 ([HARD CODED]. "You paid ...... L$... " - message needs translation) - only changes to
strings.xml are commited to make sure they make their way to localization. Code changes are to follow. Discussed at
https://codereview.productengine.com/secondlife/r/55/

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branch : product-engine