These are already available administrator/language/en-GB/en-GB.com_communityanswers.ini
COM_COMMUNITYANSWERS_FIELD_CREATED_LABEL="Created Date" COM_COMMUNITYANSWERS_FIELD_CREATED_DESC="Created Date" COM_COMMUNITYANSWERS_FIELD_CREATED_BY_DESC="Select the name of the user who created the question."
COM_COMMUNITYANSWERS_FIELD_CREATED_BY_LABEL="Created by" COM_COMMUNITYANSWERS_FIELD_FEATURED_DESC="Assign the question to the featured blog layout"
I think you're confused. These constants must be located in the site's language file.
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