we use italics to format 'no value' and 'some value', and for language fallback indictor text, among other things.
italics do not work well nor are suitable for all languages. [1] (also is a bit weird in arabic scripts)
although they are somewhat 'nice' in latin script, we should generally avoid them (e.g. avoid font-style: italic). we might be able to use <em> instead or something else entirely, but should make sure it is something that can be handled appropriately in those languages.
http://www.localizingjapan.com/blog/2011/02/27/italics-in-japanese/