core: Fix some grammar and style issues with the permission prompt.

core/core.js

@@ -443,7 +443,7 @@ async function getProcessBlob(blobId, key, options) {
 						} else if (typeof message === 'string') {
 							action = `Post a private message.`;
 						} else {
-							action = `Post a ${message?.type}.`;
+							action = `Publish ${'aeiou'.indexOf(message?.type?.toLowerCase()?.substring(0, 1)) != -1 ? 'an' : 'a'} "${message?.type}" message.`;
 						}
 					} catch {}
 					return Promise.resolve(