Fix broken links in _posts/2019-08-1.3.md (#3884)

website/src/_posts/2019-08-1.3.md

@@ -94,7 +94,7 @@ See [#1440](https://github.com/transloadit/uppy/pull/1440), [#1565](https://gith
 
 Thanks to our amazing contributors, Uppy now speaks: Arabic, Chinese, Dutch, English, Finnish, French, German, Hungarian, Italian, Japanese, Persian, Portuguese, Russian, Serbian, Spanish an Turkish!
 
-New translations are rolling in every month, but there are plenty more languages out there that Uppy would love to learn. Please consider [contributing your language](http://localhost:4000/docs/locales/#Contributing-a-new-language) as well!
+New translations are rolling in every month, but there are plenty more languages out there that Uppy would love to learn. Please consider [contributing your language](http://uppy.io/docs/locales/#Contributing-a-new-language) as well!
 
 We’ve also added docs for locales — how to use from NPM and CDN, auto-generated list of languages that are supported already and an invitation to add more [#1553](https://github.com/transloadit/uppy/pull/1553).
 
@@ -119,7 +119,7 @@ Robodog is an Uppy-based library that helps you talk to the Transloadit API. Sin
 ## Website and docs
 
 * Added Community projects — a page with Uppy plugins and integrations developed by the community [#1620](https://github.com/transloadit/uppy/pull/1620). [Add yours](https://github.com/transloadit/uppy/blob/master/website/src/docs/community-projects.md)!
-* Custom plugin [example](http://localhost:4000/docs/writing-plugins/#Example-of-a-custom-plugin) — now you have a reference to look at when writing your own plugin for Uppy [#1623](https://github.com/transloadit/uppy/pull/1623).
+* Custom plugin [example](http://uppy.io/docs/writing-plugins/#Example-of-a-custom-plugin) — now you have a reference to look at when writing your own plugin for Uppy [#1623](https://github.com/transloadit/uppy/pull/1623).
 * Added signature authentication to Transloadit example [#1705](https://github.com/transloadit/uppy/pull/1705).
 * Documented Companion’s Auth and Token mechanism [#1540](https://github.com/transloadit/uppy/pull/1540).
 * Updated AWS S3 Multipart documentation wrt CORS settings [#1539](https://github.com/transloadit/uppy/pull/1539).