Replaced i18n with tpl in oembed.js (#13472)

refs: #13380

- The i18n package is deprecated. It is being replaced with the tpl package.

core/server/api/canary/utils/validators/input/oembed.js

@@ -1,12 +1,13 @@
 const Promise = require('bluebird');
-const i18n = require('../../../../../../shared/i18n');
+const tpl = require('@tryghost/tpl');
 const errors = require('@tryghost/errors');
+const messages = {noUrlProvided: 'No url provided.'};
 
 module.exports = {
     read(apiConfig, frame) {
         if (!frame.data.url || !frame.data.url.trim()) {
             return Promise.reject(new errors.BadRequestError({
-                message: i18n.t('errors.api.oembed.noUrlProvided')
+                message: tpl(messages.noUrlProvided)
             }));
         }
     }