Add locale documentation

docs/locale.md

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+sidebar_position: 9
+---
+
+# Locale
+
+**What are the languages supported by Topper?**
+
+Topper supports English and Brazilian Portuguese.
+
+**How to set a specific locale?**
+
+By default, Topper will use the locale set on the user's browser. If that locale is not supported it will default to English.
+
+To set a specific locale, you can set it as query parameter such as: `https://app.topperpay.com/?bt=<bootstrap token>&locale=en`. The supported values are `en`, `en-US`, `pt` and `pt-BR`.
+
+When the user user authenticates in Topper, the locale will be set accordingly with the user preferences.
+
+**Using the [Web SDK](./web-sdk.md):**
+
+```js
+const topper = new TopperWebSdk({ locale: TOPPER_LOCALES.PT });
+
+topper.initialize({ bootstrapToken: <bootstrap token> });
+```

docs/theming.md

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-sidebar_position: 9
+sidebar_position: 10
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 # Theming

docs/web-sdk.md

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-sidebar_position: 10
+sidebar_position: 11
 ---
 
 # Web SDK