Merge branch 'feature/log-api-endpoints' into 'marietje-zuid'

Add logging for API endpoints

Closes #74

See merge request technicie/MarietjeDjango!83

marietje/songs/templates/songs/upload.html

@@ -179,14 +179,13 @@
                         }).catch(e => {
                             console.log(e);
                             if (e instanceof Response) {
-                                // Intercept an HTTP 413 error (entity too large), as this might
-                                // be thrown by a (reverse) proxy server and its payload is not
-                                // nicely formatted as the code below expects.
-                                if (e.status === 413) {
-                                    this.fileObjects[i].error_message = "The song you tried to upload is too large in size. (HTTP 413 error)";
-                                    this.fileObjects[i].success = false;
-                                } else {
-                                    this.fileObjects[i].error_message = `${e.statusText} (${e.status})`;
+                                try {
+                                    e.json().then(data => {
+                                        this.fileObjects[i].error_message = data.errorMessage;
+                                        this.fileObjects[i].success = false;
+                                    });
+                                } catch {
+                                    this.fileObjects[i].error_message = "An exception occurred while uploading this file, please try again.";
                                     this.fileObjects[i].success = false;
                                 }
                             } else {