<em> instead of italic in sub-branches

Created by Konrad Stobiecki, 30th Nov 2011. (originally Lighthouse ticket #55):

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Hi!
In unordered lists:

- level 1 - _ comment _ : displays _comment_ (in italics)
  - level 2 - _ comment _ : displays < em > comment < /em > (instead italics)
    - level 3,4 and so on - _ comment _ : displays something like ..lt..amp..em> comment ...lt ..amp ../em>

Regards,
Konrad