Non expressive variable name on interactive.py

[rafaelteodosio]

Issue: On file ...\core\training\interactive.py in the line 839 has a variable with a non expressive name i.

Overview of the Solution::
Change the name from i to something like interactive_story_counter.

[sara-tagger]

Thanks for raising this issue, @joejuzl will get back to you about it soon✨

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