Policy on in-game Language.

Use of language found to be racist, rude, sexually explicit, insulting, threatening, defamatory, abusive, hateful, or harmful shall warrant a warning or account suspension.

Words blocked by the chat filter are considered inappropriate for in-game use. Altering a word to avoid the chat filter is seen as use of offensive language. This is true, regardless of the language it is written in.
 
For more details, please read through our account policy here.