Write text blocks with formatting

Tiptap replaces the plain textarea: bold, italic, subheading, lists and
links. Stored as Markdown so API clients keep reading and writing the
same field, rendered with react-markdown.

messages/en.json

@@ -485,6 +485,17 @@
 				"unsupportedType": "This format is not accepted. Use JPEG, PNG, WebP, AVIF, GIF or TIFF.",
 				"unreadableImage": "The file cannot be read as an image. Check whether it is complete.",
 				"unknown": "That did not work just now. Try again."
+			},
+			"format": {
+				"bold": "Bold",
+				"italic": "Italic",
+				"heading": "Subheading",
+				"bulletList": "Bullet list",
+				"orderedList": "Numbered list",
+				"link": "Add link",
+				"unlink": "Remove link",
+				"linkTarget": "Link address",
+				"linkApply": "Apply"
 			}
 		},
 		"brands": {