remove italic style (use bold text instead)

In Drupal Core, there are so many italic texts. It's hard to read. especially in other non-latin words.

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I would suggest to remove it or use bold text instead, or provide a way in core theme to custom it without theme mods.

some ref:
http://shoobe01.blogspot.com/2007/07/why-dont-we-use-italics-online-anyw...