As sorry as I am, but you have forgotten to add an English translation to your text in your mother tongue, and you like anyone else in this forum have agreed to follow our rules and guidelines with confirming your registration.
One of our many rules and guidelines asks to always add an English translation to your texts in native language. The short form is found here in our FAQ.¹
This means that it is absolutely okay to write in your native language, at least if you add an English translation to it.
The reason behind this is in short, we want our users to be a big community that is able to communicate with each other and does not exclude other users through the use of language as a measure of exclusion, we want to be inclusive and be able to talk together instead of against another.
We believe it is better when any user can open a topic and is directly able to read along and see what this topic is about.
As a community, we once discussed the use of language, and the result is what we have been practicing ever since - and what we expect of everyone.
Michelist
¹ You were able to register your account here in a full English language process, so you should also be able to add English translations to your texts in mother tongue. At least if you not prefer to directly use English, which has disadvantages for those who do not understand English and need to use a translator, because they can’t recognize the mistakes of the translator, so your original text together with the translation is really appreciated.