Updating the TiddlyWiki used in this activity
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1. Download the latest version of TiddlyWiki from
   http://www.tiddlywiki.com and save it as empty.html in the activity
   data directory.

2. Add spanish locale from https://github.com/TiddlyWiki/translations

   * download locale.es.js
   * open empty.html and open the tiddler called "locale"
   * copy the content of the downloaded file to the content of the tiddler