Prevent non-Korean contents from being processed

[dahlia]

HTML elements can contain an attribute lang to indicate the language of its content. If an HTML element is guaranteed that its content does not consist of Korean, i.e., it has a lang attribute and the language tag does not start with ko, Seonbi should not process the element and its contents.

For example, the following input:

<p>小說 <cite lang="ja">徳川家康</cite>는 韓國에서 <cite>大望</cite>이라는
海賊版으로 옮겨진 것이 더 有名했다.</p>

… should be processed like:

<p>소설 <cite lang="ja">徳川家康</cite>는 한국에서 <cite>대망</cite>이라는
해적판으로 옮겨진 것이 더 유명했다.</p>

[dahlia]

Now Chinese characters in non-Korean contents are no more phoneticized to hangul. However, still some inappropriate transformations are applied to them. For example, Chinese/Japanese stops (、 & 。) are still transformed into Western stops (, & .).