All those question basically answer themselves.

English only.
Profanity is not allowed.
Graphic/explicit Content is not allowed.
Correct use of the English language is expected.

Basically, the same standards you would have of an issue of a Transformers comic you could pick up from a shop or an episode you could see on TV. Death and destruction is still rife in those mediums without the use of swearing or gratuitous violence.