add better verbiage when an offer has both description and amount

src/views/NewActivityView.vue

@@ -35,7 +35,8 @@
             didInfo(offer.offeredByDid, activeDid, allMyDids, allContacts)
           }}</span>
           offers
-          <span v-if="offer.objectDescription">{{ offer.objectDescription }}</span>
+          <span v-if="offer.objectDescription">{{ offer.objectDescription }}
+          </span>{{ offer.objectDescription && offer.amount ? ", and " : "" }}
           <span v-if="offer.amount">{{
             displayAmount(offer.unit, offer.amount)
           }}</span>