[Bugs] #4588 Chart LOW: Chart activity: filter input to only accept valid values

[Sugar Labs Bugs]

#4588: Chart activity: filter input to only accept valid values
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       Reporter:  DeepakMuddha  |       Owner:  walter
           Type:  enhancement   |      Status:  new
       Priority:  Low           |   Milestone:  Unspecified
      Component:  Chart         |     Version:  Unspecified
       Severity:  Minor         |    Keywords:  AU1B
Distribution/OS:  Unspecified   |  Bug Status:  Assigned
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 Error when inputting value with preceding "$" causes a problem - Invalid
 value The value must be a number (integer or decimal) - the wording is too
 advanced for primary school students to understand, recommend implementing
 a filter to prevent such vales from being entered

 Chart activity v8

 [https://sugardextrose.org/issues/2951]
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Ticket URL: <http://bugs.sugarlabs.org/ticket/4588>
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