Say Finish instead of Publish, and match login, cookies, privacy, and account-delete copy to the decided wording.

messages/en/create/upload.json

@@ -2,7 +2,7 @@
   "errors": {
     "generic": "Something went wrong while uploading. Try again.",
     "tooLarge": "That file is too large. Community photos can be up to 5 MB; attachments up to 10 MB.",
-    "unauthorized": "Sign in to upload files. Use Save progress if you started without an account.",
+    "unauthorized": "Log in to upload files. Use Save progress if you started without an account.",
     "misconfigured": "Uploads are not available on this server yet.",
     "empty": "That file is empty. Choose a file that has content.",
     "svg": "SVG files aren't supported. Export a JPEG, PNG, WebP, or GIF instead.",