Replace site by plateforme in liens component

src/components/url/liens.json

@@ -1,7 +1,7 @@
 {
   "collectionName": "components_url_liens",
   "info": {
-    "displayName": "Liens",
+    "displayName": "Vidéo",
     "icon": "hand-pointer",
     "description": ""
   },
@@ -10,7 +10,7 @@
     "url": {
       "type": "string"
     },
-    "sit": {
+    "plateforme": {
       "type": "enumeration",
       "enum": [
         "Youtube",