[Trac #1251] Include improved calculator

[Zarro Boogs per Child]

#1251: Include improved calculator
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 Reporter:  rwh            |        Owner:  J5     
     Type:  enhancement    |       Status:  new    
 Priority:  normal         |    Milestone:  Trial-2
Component:  new component  |   Resolution:         
 Keywords:                 |  
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Comment (by cjb):

 > No, they should be localized where possible. It's far better to use
 gettext("Mode") and gettext("Clear") than to use "ce" and "ac".

 Nigeria has >500 "living" languages, and is a Trial-1 country.  Do we
 localize for all of those (in the next week!), or provide something that
 is meaningful to most people who've used a calculator?  (Note that the
 people who developed the Calculadora activity and chose ac/ce are not
 native English speakers, so it was good enough for them.)

 > All four keys should work.

 We're just talking about changing button labels here, not keybindings; I
 agree that all intuitive keybindings should do the right thing.

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Ticket URL: <http://dev.laptop.org/ticket/1251#comment:13>
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