[docs] [issue19824] string.Template: Rewrite docs to emphasize i18n use case

[R. David Murray]

R. David Murray added the comment:

Let's retitle this, then.

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nosy: +r.david.murray
title: string.Template: Add PHP-style variable expansion example -> string.Template: Rewrite docs to emphasize i18n use case

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19824>
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