[blog] December 2019 Update

docs/pages/blog/december-2019-update.js

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+import React from 'react';
+import MarkdownDocs from 'docs/src/modules/components/MarkdownDocs';
+import markdown from './december-2019-update.md';
+
+export default function Page() {
+  return <MarkdownDocs markdown={markdown} blog disableAd disableToc disableEdit />;
+}

docs/pages/blog/december-2019-update.md

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+---
+description: Here are the most significant improvements in December.
+---
+
+# December 2019 Update
+
+**Olivier Tassinari**
+
+*January 7, 2020*
+
+Here are the most significant improvements in December:
+
+- 🚨 We have introduce a new [Alert](https://material-ui.com/components/alert/) component in the lab, thanks to **[@dimitropoulos](https://github.com/dimitropoulos)** ([#18702](https://github.com/mui-org/material-ui/pull/18702)). The component also supports composition with a [Snackbar](/components/snackbars/#customized-snackbars).
+
+  ![Alert](/static/blog/december-2019-update/alert.png)
+
+  <p class="blog-description">Standard variant</p>
+
+  ![Alert](/static/blog/december-2019-update/alert-filled.png)
+
+  <p class="blog-description">Filled variant</p>
+
+- 👤 We have added [stacking](/components/avatars/#grouped) support to the avatar.
+
+  ![Stacking](/static/blog/december-2019-update/stacking.png)
+
+- ↕️ We have added [vertical](/components/buttons/#group-orientation) support to the button group.
+
+  ![Vertical button](/static/blog/december-2019-update/vertical-buttons.png)
+
+- 🌎 We have almost doubled the number of supported [locales](/guides/localization/#localization) from 13 to 22, thanks to our awesome contributors. [Help us](https://github.com/mui-org/material-ui/blob/master/packages/material-ui/src/locale/index.js) double this number next month 🚀!
+
+But this summary is just scratching the surface. We have accepted 168 commits from 73 different contributors. We have changed 1,059 files with 13,468 additions and 8,584 deletions.
+
+## Our roadmap intent for January
+
+*(We'll do our best, no guarantee!)*
+
+- 💄 We will keep working on a new [pagination](https://github.com/mui-org/material-ui/pull/19049) component. You can already [preview it](https://deploy-preview-19049--material-ui.netlify.com/components/pagination/) (lead by [**@mbrookes**](https://github.com/mbrookes)).
+
+  ![Pagination](/static/blog/december-2019-update/pagination.png)
+
+- 📅 We will keep working on a major upgrade of the [date/time picker](https://github.com/mui-org/material-ui-pickers/issues/1293) components. We are working on desktop and range support (lead by [**@dmtrKovalenko**](https://github.com/dmtrKovalenko)).
+
+  ![Date picker](/static/blog/december-2019-update/date-picker.png)
+
+- 🧮 We will keep working on a new [data grid](https://github.com/mui-org/material-ui/pull/18872) component. You can already [preview it](https://deploy-preview-18872--material-ui.netlify.com/components/data-grid/) (lead by [**@oliviertassinari**](https://github.com/oliviertassinari)).
+
+  ![Data grid](/static/blog/december-2019-update/data-grid.png)
+
+❓ Please upvote our [GitHub issues](https://github.com/mui-org/material-ui/issues) if you want something specific. The number of 👍 helps us to prioritize.
+
+<hr />
+
+Material-UI is an MIT-licensed open source project. It’s an independent project with ongoing development helped by the support of these awesome [backers](/discover-more/backers/). Please join them ✨.

docs/src/pages.js

@@ -215,6 +215,7 @@ const pages = [
   {
     pathname: '/blog',
     children: [
+      { pathname: '/blog/december-2019-update' },
       { pathname: '/blog/november-2019-update' },
       { pathname: '/blog/october-2019-update' },
       { pathname: '/blog/september-2019-update' },