Add non-optional default parameters in constructor

src/app.js

@@ -29,6 +29,30 @@ export default class {
    * @param {object} contentData
    */
   constructor(params, contentId, contentData = {}) {
+    params = Util.extend({
+      l10n: {
+        recordAnswer: 'Record',
+        pause: 'Pause',
+        continue: 'Continue',
+        download: 'Download',
+        done: 'Done',
+        retry: 'Retry',
+        microphoneNotSupported: 'Microphone not supported. Make sure you are using a browser that allows microphone recording.',
+        microphoneInaccessible: 'Microphone is not accessible. Make sure that the browser microphone is enabled.',
+        insecureNotAllowed: 'Access to microphone is not allowed in your browser since this page is not served using HTTPS. Please contact the author, and ask him to make this available using HTTPS',
+        statusReadyToRecord: 'Press a button below to record your answer.',
+        statusRecording: 'Recording...',
+        statusPaused: 'Recording paused. Press a button to continue recording.',
+        statusFinishedRecording: 'You have successfully recorded your answer! Listen to the recording below.',
+        downloadRecording: 'Download this recording or retry.',
+        retryDialogHeaderText: 'Retry recording?',
+        retryDialogBodyText: 'By pressing "Retry" you will lose your current recording.',
+        retryDialogConfirmText: 'Retry',
+        retryDialogCancelText: 'Cancel',
+        statusCantCreateTheAudioFile: 'Can\'t create the audio file.'
+      }
+    }, params);
+
     const rootElement = document.createElement('div');
     rootElement.classList.add('h5p-audio-recorder');
 

src/components/Util.js

@@ -0,0 +1,25 @@
+/** Class for utility functions */
+class Util {
+  /**
+   * Extend an array just like JQuery's extend.
+   * @param {object} arguments Objects to be merged.
+   * @return {object} Merged objects.
+   */
+  static extend() {
+    for (let i = 1; i < arguments.length; i++) {
+      for (let key in arguments[i]) {
+        if (arguments[i].hasOwnProperty(key)) {
+          if (typeof arguments[0][key] === 'object' && typeof arguments[i][key] === 'object') {
+            this.extend(arguments[0][key], arguments[i][key]);
+          }
+          else {
+            arguments[0][key] = arguments[i][key];
+          }
+        }
+      }
+    }
+    return arguments[0];
+  }
+}
+
+export default Util;