fix meter squared

Author: danielfeismann

src/test/groovy/edu/ie3/datamodel/utils/validation/SystemParticipantValidationUtilsTest.groovy

@@ -454,7 +454,7 @@ class SystemParticipantValidationUtilsTest extends Specification {
     where:
     invalidWecType                                                                                                                                                              || expectedException
     new WecTypeInput(uuid, id, capex, opex, sRated, cosPhiRated, wecCharacteristic, Quantities.getQuantity(110d, EFFICIENCY), rotorArea, hubHeight)                             || new InvalidEntityException("Efficiency of the converter of WecTypeInput must be between 0% and 100%", invalidWecType)
-    new WecTypeInput(uuid, id, capex, opex, sRated, cosPhiRated, wecCharacteristic, etaConv, Quantities.getQuantity(-10, ROTOR_AREA), Quantities.getQuantity(-200, HUB_HEIGHT)) || new InvalidEntityException("The following quantities have to be zero or positive: -10 m², -200 m", invalidWecType)
+    new WecTypeInput(uuid, id, capex, opex, sRated, cosPhiRated, wecCharacteristic, etaConv, Quantities.getQuantity(-10, ROTOR_AREA), Quantities.getQuantity(-200, HUB_HEIGHT)) || new InvalidEntityException("The following quantities have to be zero or positive: -10 ㎡, -200 m", invalidWecType)
   }
 
   def "SystemParticipantValidationUtils.checkEvcs() recognizes all potential errors for a evcs"() {