Added new units to the project size field (Previously known as Area)

Based on popular demand, we added new units to the project size dropdown.
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It is now possible to select from a various list of units; "m^2", "m^3", "km^2", "ft^2", "ha", "m", "km", "kW", "MW", "GW", "%", "kWh", "MWh", "GWh", "TWh", "kV"]

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The field is now also called "Project size" to have a wider scope of use cases.