add actual translations docs file

site/content/en/docs/Contributing/translations.md

@@ -0,0 +1,21 @@
+---
+title: "Translations"
+date: 2019-09-30
+weight: 3
+description: >
+  How to add translations
+---
+
+All translations are stored in the top-level `translations` directory.
+
+### Adding Translations To an Existing Language
+* Run `make extract` to make sure all strings are up to date
+* Add translated strings to the appropriate json files in the 'translations'
+  directory.
+
+### Adding a New Language
+* Add a new json file with the locale code of the language you want to add
+  translations for, e.g. en for English.
+* Run `make extract` to populate that file with the strings to translate in json
+  form.
+* Add translations to as many strings as you'd like.