Gant Chart issue with persian language

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Hi everybody

When we create a new gantchart in persian language, in result we get ??? instead of words.
I think this issue is related to utf-8 encode of creating ganchart image.

there is also such a problem in wiki module.

Best Regards
Hasan Gharehasanloo

Yes, ganttchart module has issues with utf-8. I tried fixing it several times but no solution yet.

I am not aware of this in Wiki module. Can you give me the Persian translation you are using and the exact spot in Wiki where it happens?