Update zh-CHS.xml

typo fixes, and some translations for better understanding.
show horizontal scrollbars to see all of entry

It was not possible to see the full entry text. So displaying horizontal
scrollbars is the easiest fix.
Merge pull request #332 from LeonCheung/patch-1

Update zh-CHS.xml
Added UTF-8 BOM header in Chinese translation
Merge pull request #334 from FroggieFrog/Horizontal_Scrollbars

show horizontal scrollbars to see all of entry
Updated Korean language file - thx domddol
Merge branch 'master' of https://github.com/SubtitleEdit/subtitleedit