I was of the impression that UILabel could be made aware of the language in the string it presents, but I don't find any API for this. I guess that it would be an attribute in NSAttributedString.
This is important for VoiceOver and font selection, but I don't know if Cocoa Touch supports this. In Safari, VoiceOver seems to respect the HTML language tags both for VoiceOver and font selection.
Font selection is important e.g. when choosing between Mainland Chinese, Hongkong/Taiwanese, and Japanese variants of certain characters. An example where Safari does this only by looking at the HTML lang tag is this page: en.wiktionary.org/%E6%BB%91
For VoiceOver it is of course important that the correct voice and pronunciation rules are used.
