Add documentation about how to add a new L10N integration (#12043)
Add documentation about how to add a new L10N integration (#12043)

This will be useful if/when we add another mode to Bedrock for a different website.
pascalchevrel/bedrock,pascalchevrel/bedrock,mozilla/bedrock,alexgibson/bedrock,alexgibson/bedrock,mozilla/bedrock,alexgibson/bedrock,pascalchevrel/bedrock,mozilla/bedrock,pascalchevrel/bedrock,alexgibson/bedrock,mozilla/bedrock,craigcook/bedrock,craigcook/bedrock,craigcook/bedrock,craigcook/bedrock