change field type for date fields

interim/source_strings.yaml

@@ -779,6 +779,8 @@ en:
         label: Last Checked Date
         # check_date field placeholder
         placeholder: YYYY-MM-DD
+        # 'terms: survey date,last survey date'
+        terms: '[translate with synonyms or related terms for ''Last Checked Date'', separated by commas]'
       circumference:
         # circumference=*
         label: Circumference (at Breast Height)