[supply_demand_heterogeneity] Translation Update (#173)

* [supply_demand_heterogeneity] Translation Update

Hi, everyone! I have updated the translation of supply_demand_heterogeneity, please have a look and give me some suggestions. Thank you!

* [supply_demand_heterogeneity] Translation Update

* minor updates

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Co-authored-by: Humphrey Yang <u6474961@anu.edu.au>

Author: XYshi725