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Writer's beta is an English speaking site and every user should stick to it, but there are some non native speakers - like myself - who do not have a perfect domain of language and may commit some errors - what will give more work to reviewers - and also give some localized answers valid only for other countries than USA, England and related.
My point is, should such members consider to refrain their involvement because of that or they should contribute every time they think the answer may help? The site description is not specific about that.
Please notice that adding something like "not English point of view" to the answers seems too unpractical. Maybe a tag for that could be created, but it doesn't make sense to append such notices to every reply text and it's hard to know when an answer might not be advised outside English context.