fix: indent & line highlighting in guides/internationalization.mdx

[ArmandPhilippot]

Description (required)

Fixes a few nitpicks in guides/internationalization.mdx:

• in the domains section, the highlighting for inserted lines should be restricted to the domains property
• in the code snippet of Custom locale paths, the indent for codes was wrong
• in the Create localized folders section, missing backticks for a route (all other routes on the page are wrapped with backticks)

Related issues & labels (optional)

• Suggested label: code snippet update

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[yanthomasdev]

LGTM! Thanks!