Per-language Editor

The Multilang Content metabox is a single edit screen with one wysiwyg canvas per language:

┌── Multilang Content ──────────────────┐
│                                       │
│ EN                                    │
│  ┌─────────────────────────────────┐  │
│  │ [B][I][🔗] [+ Insert Block]     │  │
│  │                                 │  │
│  │ Some paragraph...               │  │
│  │ [📦 CTA Block: "Get started"]  │  │
│  │ More text...                    │  │
│  └─────────────────────────────────┘  │
│                                       │
│ ES                                    │
│  ┌─────────────────────────────────┐  │
│  │ ...                             │  │
│  └─────────────────────────────────┘  │
└───────────────────────────────────────┘

You can insert custom blocks inline from the wysiwyg toolbar. The available blocks are read automatically from:

functions/project/config/custom-blocks_config.php    ← project-specific blocks
functions/project/config/default-blocks_config.php   ← framework defaults (footnote, highlighted, etc.)

No extra setup — anything in those two files shows up in the block picker.