rest-api/config/ApiUiLabels.xml

<?xml version="1.0" encoding="UTF-8"?>
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<resource xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="https://ofbiz.apache.org/dtds/ofbiz-properties.xsd">
    <property key="GenericServiceValidationErrorMessage">
        <value xml:lang="en">${service} validation failed. The request contained invalid information and could not be processed.</value>
    </property>
    <property key="GenericServiceExecutionGenericEntityOperationErrorMessage">
        <value xml:lang="en">${service} execution failed. The request contained invalid information and could not be processed.</value>
    </property>
    <property key="GenericServiceExecutionGenericExceptionErrorMessage">
        <value xml:lang="en">${service} execution failed. The service encountered an error; please try again later.</value>
    </property>
    <property key="NoSuchEntityDefaultMessage">
        <value xml:lang="en">${service} execution failed. The requested entity does not exist.</value>
    </property>
     <property key="GenericServiceErrorMessage">
        <value xml:lang="en">${service} returned error. The request contained invalid information and could not be processed.</value>
    </property>
</resource>