feat: changed minimum of 2 locales to minimum of 1 (#6406)

* feat: changed minimum of 2 locales to minimum of 1

* feat: only show i18n editor toggle if there are multiple locales

Author: dfdez

packages/decap-cms-core/src/components/Editor/EditorInterface.js

@@ -238,8 +238,8 @@ class EditorInterface extends Component {
 
     const previewEnabled = isPreviewEnabled(collection, entry);
 
-    const collectionI18nEnabled = hasI18n(collection);
     const { locales, defaultLocale } = getI18nInfo(this.props.collection);
+    const collectionI18nEnabled = hasI18n(collection) && locales.length > 1;
     const editorProps = {
       collection,
       entry,

packages/decap-cms-core/src/constants/__tests__/configSchema.spec.js

@@ -494,6 +494,19 @@ describe('config', () => {
         }).toThrowError(`'i18n.locales[1]' must NOT have more than 10 characters`);
       });
 
+      it('should throw error when locales is less than 1 items', () => {
+        expect(() => {
+          validateConfig(
+            merge({}, validConfig, {
+              i18n: {
+                structure: 'multiple_folders',
+                locales: [],
+              },
+            }),
+          );
+        }).toThrowError(`'i18n.locales' must NOT have fewer than 1 items`);
+      });
+
       it('should allow valid locales strings', () => {
         expect(() => {
           validateConfig(

packages/decap-cms-core/src/constants/configSchema.js

@@ -20,7 +20,7 @@ const i18n = {
     structure: { type: 'string', enum: Object.values(I18N_STRUCTURE) },
     locales: {
       type: 'array',
-      minItems: 2,
+      minItems: 1,
       items: localeType,
       uniqueItems: true,
     },