Update CHANGELOG and history

Author: mmistakes

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### Enhancements
 
+- Add missing Vietnamese localized UI text strings. [#2097](https://github.com/mmistakes/minimal-mistakes/pull/2097)
 - Replace jQuery Smooth Scroll with Smooth Scroll + Gumshoe. [#2082](https://github.com/mmistakes/minimal-mistakes/pull/2082)
 - Add styling for [GFM task lists](https://help.github.com/en/articles/about-task-lists#creating-task-lists). [#2092](https://github.com/mmistakes/minimal-mistakes/issues/2092)
 - Update Google Universal Analytics to load async. [#2079](https://github.com/mmistakes/minimal-mistakes/pull/2079)

docs/_docs/18-history.md

@@ -5,14 +5,15 @@ permalink: /docs/history/
 excerpt: "Change log of enhancements and bug fixes made to the theme."
 sidebar:
   nav: docs
-last_modified_at: 2019-03-22T16:08:53-04:00
+last_modified_at: 2019-03-22T16:10:40-04:00
 toc: false
 ---
 
 ## Unreleased
 
 ### Enhancements
 
+- Add missing Vietnamese localized UI text strings. [#2097](https://github.com/mmistakes/minimal-mistakes/pull/2097)
 - Replace jQuery Smooth Scroll with Smooth Scroll + Gumshoe. [#2082](https://github.com/mmistakes/minimal-mistakes/pull/2082)
 - Add styling for [GFM task lists](https://help.github.com/en/articles/about-task-lists#creating-task-lists). [#2092](https://github.com/mmistakes/minimal-mistakes/issues/2092)
 - Update Google Universal Analytics to load async. [#2079](https://github.com/mmistakes/minimal-mistakes/pull/2079)