added accept header for file uploads

Author: rickcrawford

src/widget.js

@@ -1905,6 +1905,9 @@
 
           response = await fetch(`${this.config.apiBase}/api/sources/${sourceId}/submit/`, {
             method: 'POST',
+            headers: {
+              'Accept': 'application/json'
+            },
             body: formDataToSend
             // Don't set Content-Type header - browser will set it with boundary
           });
@@ -1919,6 +1922,7 @@
           method: 'POST',
           headers: {
             'Content-Type': 'application/json',
+            'Accept': 'application/json'
           },
           body: JSON.stringify(payload)
         });

test/localization.test.js

@@ -669,3 +669,4 @@ describe('Language Fallback Detection', () => {
 
 
 
+