Fix code interface not staging values in plain text mode

Fixes #3296

app/src/interfaces/code/code.vue

@@ -55,7 +55,7 @@ export default defineComponent({
 		},
 		language: {
 			type: String,
-			default: 'text/plain',
+			default: 'plaintext',
 		},
 		type: {
 			type: String,
@@ -154,7 +154,7 @@ export default defineComponent({
 						}
 						return found;
 					});
-				} else if (lang === 'text/plain') {
+				} else if (lang === 'plaintext') {
 					codemirror.value.setOption('mode', { name: null });
 				} else {
 					await import(`codemirror/mode/${lang}/${lang}.js`);

app/src/interfaces/code/index.ts

@@ -9,11 +9,16 @@ const choicesMap = CodeMirror.modeInfo.reduce((acc: Record<string, string>, choi
 		return acc;
 	}
 
+	if (choice.mode == null || choice.mode == 'null') {
+		choice.mode = 'plaintext';
+	}
+
 	if (choice.mode in acc) {
 		acc[choice.mode] += ' / ' + choice.name;
 	} else {
 		acc[choice.mode] = choice.name;
 	}
+
 	return acc;
 }, {});