There is nothing in the Community Guidelines that doesn't allow people to write posts other than English. HOWEVER, to respect people from other countries we have been encouraging members to write posts IN THE MAIN FORUM IN ENGLISH. So that others who may have some idea or interesting anecdotes on the topic could share them as well.
This being said we have been reminding, at least the members of our group, to be aware of the forum they are posting in. If it is in the main forum, write it in English. If it is in the group forum, write it in the language they are comfortable in. And if the topic is interesting or they would want inputs from others as well, to write it in English even though they are in the group forum.
Please note that most "violators" of the "English only in the Main Forum" unwritten rule are newbies. Maybe they are so excited to post their question/topic and are unaware of this unwritten rule that they just post anyway, anywhere.
However, it is incumbent upon us "oldies" to remind them POLITELY of their transgression and not put them off as disrespectful persons.

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