docs: add quick writeup on configuring language-specific builds in Bolt

docs-site/src/pages/docs/45-development/30-build-tools/40-internationalization.md

@@ -0,0 +1,53 @@
+---
+title: Internationalization 
+---
+
+## Optimizing Bolt's Build For Different Languages
+
+> NOTE: add note about compiling Bolt for just one specific language at a time vs compiling for multiple languages
+
+
+### Step 1. Add a `lang` prop to your `.boltrc` config
+
+This should be an array of the two-character language codes you want to compile optimized builds for.
+
+> Note: currently this only includes `en` and `ja` althouh more language-specific builds could be added in the future.
+
+#### Only Compile Japanese-optimized Build
+```
+lang: ['ja'], // ex. only compile the ja-optimized build
+```
+
+#### Compile Japanese and English optimized Builds (Japanese set as the default)
+```
+lang: ['ja', 'en'], // ja + en in the same build; ja used by default on docs site
+```
+
+#### Compile Japanese and English optimized Builds (English set as the default)
+```
+lang: ['en', 'ja'], // en + ja in the same build; en used by default on docs site
+```
+
+#### Only Compile Japanese Optimized Build (Deprecated String Lang Method)
+```
+lang: 'ja', //  only ja (old to-be-removed single-lang build)
+```
+
+> Note: not defining a lang prop will automatically configure the build to internally use the `en` default
+
+
+### Step 2. Disable the `@bolt/build-tools` cache
+
+This will get updated in the future but for now, you'll likely need to manually disable the build tools cache for a clean initial build
+
+```
+// switch `enableCache` in the `.boltrc` to false
+enableCache: false,
+```
+
+### Step 3. Enably i18n (If Doing Local Development)
+
+If you are running Bolt locally in dev mode, make sure the `i18n` CLI flag is set to true.
+
+This can be done by either by running `npm run start:lang` in the docs site folder for local Bolt development OR `./node_modules/.bin/bolt start --i18n` for everyone else.
+