Added support for mkdocs-git-revision-date-localized-plugin (#1373)

* #1350 update base template to include git revision date

* #1350 add localized revision date

* #1350 support for v0.3 of mkdocs-git-revision-date-localized-plugin

* #1350 add translations for source.revision.date

docs/extensions/revision_date.md

@@ -0,0 +1,45 @@
+# Revision date
+
+[mkdocs-git-revision-date-localized-plugin](https://github.com/timvink/mkdocs-git-revision-date-localized-plugin) is an extension that enables adding a revision date to a markdown file.
+As the name says, it takes this revision date from GIT.
+
+## Installation
+
+Add the following lines to your `mkdocs.yml`:
+
+``` yaml
+plugins:
+  - git-revision-date-localized
+```
+
+## Usage
+
+Material for MkDocs will add the revision date to the bottom of every markdown page, for example: 
+
+```
+Last updated: 9 December 2019
+``` 
+
+To change the language, set the theme language, see [Getting started - Language][1].
+
+  [1]: https://squidfunk.github.io/mkdocs-material/getting-started/#language
+
+
+To change the date format, set the `type` parameter to one of `date`, `datetime`, `iso_date`, `iso_datetime` or `timeago`. Default is `date`. Example outputs:
+
+```bash
+28 November, 2019 # type: date
+28 November, 2019 13:57:28 # type: datetime
+2019-11-28 # type: iso_date
+2019-11-28 13:57:26 # type: iso_datetime
+20 hours ago # type: timeago
+```
+
+Example setting:
+
+```yaml
+# mkdocs.yml
+plugins:
+  - git-revision-date-localized:
+    type: timeago
+```