[Bugs] #2537 UNSP: Calculate doesn't accept ", " as a decimal separator when set to Spanish locale

[Sugar Labs Bugs]

#2537: Calculate doesn't accept "," as a decimal separator when set to Spanish
locale
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    Reporter:  garycmartin                |          Owner:  rwh                        
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Calculate                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  Unspecified                
   Seeta_dev:                             |  
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Comment(by walter):

 The attached patch seems to work. It also seems a bit fragile, but I
 didn't want to delve into the black box that is ast.parser

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2537#comment:2>
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