add field for the "two_sided=yes" tag

see https://github.com/openstreetmap/iD/issues/9329#issuecomment-1270589307

interim/source_strings.yaml

@@ -3462,6 +3462,16 @@ en:
       turning_circle:
         # turning_circle=*
         label: Shape
+      two_sided:
+        # two_sided=*
+        label: Two-Sided
+        options:
+          # two_sided=undefined
+          undefined: 'No'
+          # two_sided=yes
+          'yes': 'Yes'
+        # 'terms: double-sided'
+        terms: '[translate with synonyms or related terms for ''Two-Sided'', separated by commas]'
       usage_rail:
         # usage=*
         label: Usage Type