Go to System designer -> find "Translation" -> find key Configuration:ContextHelpSchema:LocalizableStrings.SupportEmailBodyTemplate.Value -> for required localization change data -> click the "Apply translations" button
You can create a replacement of ContextHelpSchema. To do this: go to System designer -> Advanced settings -> Custom package -> Replacing view model -> in modal window fill "Parent object" with "ContextHelpSchema (ContextHelpSchema)" -> Apply -> Here you can write your custom template and change Localizable Strings.
Yes, I did that already by Replacing view model and adding another schema in my package, but the problem is with the value, how shall I update the value of "SupportEmailBodyTemplate", it is in the format of "body=%0D%0A****" etc., I just wanted to use the plain text in the value to replace with my custom template, but it is not working/taking the plain text. How should I achieve this ?