Special colons stop label-content separation working

[RuiXuqi]

Describe the bug

Some languages use special colons (eg: Chinese uses "：" as colon), which will make the drawStringWithLabel method works bad. The label will follow content color since it cannot find ":".

String label = rawString.substring(0, rawString.indexOf(":") + 1);
String content = rawString.substring(rawString.indexOf(":") + 1);