Use custom data provider method for "delete_media"

This is not a REST endpoint, so it's better to use a custom method, see
https://marmelab.com/react-admin/DataProviders.html#adding-custom-methods

Change-Id: I256286949e77b998f759f671b2d4e9790f8ca39c

src/i18n/en.ts

@@ -91,6 +91,22 @@ const en: SynapseTranslationMessages = {
       },
     },
   },
+  delete_media: {
+    name: "Media",
+    fields: {
+      before_ts: "last access before",
+      size_gt: "Larger then (in bytes)",
+      keep_profiles: "Keep profile images",
+    },
+    action: {
+      send: "Delete media",
+      send_success: "Request successfully sent.",
+      send_failure: "An error has occurred.",
+    },
+    helper: {
+      send: "This API deletes the local media from the disk of your own server. This includes any local thumbnails and copies of media downloaded. This API will not affect media that has been uploaded to external media repositories.",
+    },
+  },
   resources: {
     users: {
       name: "User |||| Users",
@@ -258,22 +274,6 @@ const en: SynapseTranslationMessages = {
         open: "Open media file in new window",
       },
     },
-    delete_media: {
-      name: "Media",
-      fields: {
-        before_ts: "last access before",
-        size_gt: "Larger then (in bytes)",
-        keep_profiles: "Keep profile images",
-      },
-      action: {
-        send: "Delete media",
-        send_success: "Request successfully sent.",
-        send_failure: "An error has occurred.",
-      },
-      helper: {
-        send: "This API deletes the local media from the disk of your own server. This includes any local thumbnails and copies of media downloaded. This API will not affect media that has been uploaded to external media repositories.",
-      },
-    },
     protect_media: {
       action: {
         create: "Unprotected, create protection",