Update translating-guide.md

docs/translating-guide.md

@@ -6,9 +6,12 @@ The MetaMask browser extension supports new translations added in the form of ne
 
 ## Adding a new Language
 
-Each supported language is represented by a folder in `app/_locales` whose name is that language's subtag ([look up a language subtag using this tool](https://r12a.github.io/app-subtags/)).
+- Each supported language is represented by a folder in `app/_locales` whose name is that language's subtag (example: `app/_locales/es/`). (look up a language subtag using the [r12a "Find" tool](https://r12a.github.io/app-subtags/) or this [wikipedia list](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes)).
+- Inside that folder there should be a `messages.json`. 
+- An easy way to start your translation is to first **make a copy** of `app/_locales/en/messages.json` (the english translation), and then **translate the `message` key** for each in-app message.
+- **The `description` key** is just to add context for what the translation is about, it **does not need to be translated**.
+- Add the language to the [locales index](https://github.com/MetaMask/metamask-extension/blob/master/app/_locales/index.json) `app/_locales/index.json` 
 
-Inside that folder there should be a `messages.json` file that follows the specified format. An easy way to start your translation is to first duplicate `app/_locales/en/messages.json` (the english translation), and then update the `message` key for each in-app message.
 
 That's it! When MetaMask is loaded on a computer with that language set as the system language, they will see your translation instead of the default one.
 
@@ -20,7 +23,7 @@ To automatically see if you are missing any phrases to translate, we have a scri
 node development/verify-locale-strings.js $YOUR_LOCALE
 ```
 
-Where `$YOUR_LOCALE` is your [locale string](https://r12a.github.io/app-subtags/), i.e. the name of your language folder.
+Where `$YOUR_LOCALE` is your locale string (example: `es`), i.e. the name of your language folder.
 
 To verify that your translation works in the app, you will need to [build a local copy](https://github.com/MetaMask/metamask-extension#building-locally) of MetaMask. You will need to change your browser language, your operating system language, and restart your browser (sorry it's so much work!).