I'm not sure about rules...
This is probably the largest Mac site on the web and if you have a question, using English will get more responses, sometimes good sometimes bad

The quality of responses has gone down hill since I joined the site, but there are still many helpful people. I focus my efforts more on problem solving other users issues than posting opinions, but every once in awhile I go on a rant like this
I don't complain about bad English bc sometimes native English speakers have the worst, whether grammar, misspellings, or because they are using autocomplete on a mobile device. Sometimes it's late at night, sometimes early in the the morning, sometimes people are in a rush and just want to get their point across, 2 of which apply to my response
I'm not picking on you, since you have a valid question.
I know sometime times I have to reread my entire post, if I have any errors, half are my mind working faster than my fingers and the other half is my iPad autocomplete.
I give every nonnative English speaker an A for effort for posting here.
I doubt many Scots, Yanks etc... Participate much on French, German, Korean, or Chinese Mac forums or any forums that are not in English.
When I travel internationally, the locals appreciate if I at least try to start the conversation in their local language...
Summary:
If you have a Mac question and you want it answered fast, with many responses/opinions/expertise, Macrumors is the #1 site on the web but you need to ask your question in English or use a translation service. I say this not just as a member but more of fact from many years experience. This website is much more helpful than the apple support forums bc more experienced Mac users participate on this forum that any other.
Sorry rant over