diff --git a/src/node/db/AuthorManager.js b/src/node/db/AuthorManager.js
index f4ef903cf..3fde1e4b1 100644
--- a/src/node/db/AuthorManager.js
+++ b/src/node/db/AuthorManager.js
@@ -1,3 +1,4 @@
+'use strict';
 /**
  * The AuthorManager controlls all information about the Pad authors
  */
@@ -19,85 +20,83 @@
  */
 
 const db = require('./DB');
-const customError = require('../utils/customError');
-const randomString = require('ep_etherpad-lite/static/js/pad_utils').randomString;
+const CustomError = require('../utils/customError');
+const randomString = require('../../static/js/pad_utils').randomString;
 
-exports.getColorPalette = function () {
-  return [
-    '#ffc7c7',
-    '#fff1c7',
-    '#e3ffc7',
-    '#c7ffd5',
-    '#c7ffff',
-    '#c7d5ff',
-    '#e3c7ff',
-    '#ffc7f1',
-    '#ffa8a8',
-    '#ffe699',
-    '#cfff9e',
-    '#99ffb3',
-    '#a3ffff',
-    '#99b3ff',
-    '#cc99ff',
-    '#ff99e5',
-    '#e7b1b1',
-    '#e9dcAf',
-    '#cde9af',
-    '#bfedcc',
-    '#b1e7e7',
-    '#c3cdee',
-    '#d2b8ea',
-    '#eec3e6',
-    '#e9cece',
-    '#e7e0ca',
-    '#d3e5c7',
-    '#bce1c5',
-    '#c1e2e2',
-    '#c1c9e2',
-    '#cfc1e2',
-    '#e0bdd9',
-    '#baded3',
-    '#a0f8eb',
-    '#b1e7e0',
-    '#c3c8e4',
-    '#cec5e2',
-    '#b1d5e7',
-    '#cda8f0',
-    '#f0f0a8',
-    '#f2f2a6',
-    '#f5a8eb',
-    '#c5f9a9',
-    '#ececbb',
-    '#e7c4bc',
-    '#daf0b2',
-    '#b0a0fd',
-    '#bce2e7',
-    '#cce2bb',
-    '#ec9afe',
-    '#edabbd',
-    '#aeaeea',
-    '#c4e7b1',
-    '#d722bb',
-    '#f3a5e7',
-    '#ffa8a8',
-    '#d8c0c5',
-    '#eaaedd',
-    '#adc6eb',
-    '#bedad1',
-    '#dee9af',
-    '#e9afc2',
-    '#f8d2a0',
-    '#b3b3e6',
-  ];
-};
+exports.getColorPalette = () => [
+  '#ffc7c7',
+  '#fff1c7',
+  '#e3ffc7',
+  '#c7ffd5',
+  '#c7ffff',
+  '#c7d5ff',
+  '#e3c7ff',
+  '#ffc7f1',
+  '#ffa8a8',
+  '#ffe699',
+  '#cfff9e',
+  '#99ffb3',
+  '#a3ffff',
+  '#99b3ff',
+  '#cc99ff',
+  '#ff99e5',
+  '#e7b1b1',
+  '#e9dcAf',
+  '#cde9af',
+  '#bfedcc',
+  '#b1e7e7',
+  '#c3cdee',
+  '#d2b8ea',
+  '#eec3e6',
+  '#e9cece',
+  '#e7e0ca',
+  '#d3e5c7',
+  '#bce1c5',
+  '#c1e2e2',
+  '#c1c9e2',
+  '#cfc1e2',
+  '#e0bdd9',
+  '#baded3',
+  '#a0f8eb',
+  '#b1e7e0',
+  '#c3c8e4',
+  '#cec5e2',
+  '#b1d5e7',
+  '#cda8f0',
+  '#f0f0a8',
+  '#f2f2a6',
+  '#f5a8eb',
+  '#c5f9a9',
+  '#ececbb',
+  '#e7c4bc',
+  '#daf0b2',
+  '#b0a0fd',
+  '#bce2e7',
+  '#cce2bb',
+  '#ec9afe',
+  '#edabbd',
+  '#aeaeea',
+  '#c4e7b1',
+  '#d722bb',
+  '#f3a5e7',
+  '#ffa8a8',
+  '#d8c0c5',
+  '#eaaedd',
+  '#adc6eb',
+  '#bedad1',
+  '#dee9af',
+  '#e9afc2',
+  '#f8d2a0',
+  '#b3b3e6',
+];
 
 /**
  * Checks if the author exists
  */
-exports.doesAuthorExist = async function (authorID) {
+exports.doesAuthorExist = async (authorID) => {
   const author = await db.get(`globalAuthor:${authorID}`);
 
-  return author !== null;
+  return author != null;
 };
 
 /* exported for backwards compatibility */
@@ -107,7 +106,7 @@ exports.doesAuthorExists = exports.doesAuthorExist;
  * Returns the AuthorID for a token.
  * @param {String} token The token
  */
-exports.getAuthor4Token = async function (token) {
+exports.getAuthor4Token = async (token) => {
   const author = await mapAuthorWithDBKey('token2author', token);
 
   // return only the sub value authorID
@@ -119,7 +118,7 @@ exports.getAuthor4Token = async function (token) {
  * @param {String} token The mapper
  * @param {String} name The name of the author (optional)
  */
-exports.createAuthorIfNotExistsFor = async function (authorMapper, name) {
+exports.createAuthorIfNotExistsFor = async (authorMapper, name) => {
   const author = await mapAuthorWithDBKey('mapper2author', authorMapper);
 
   if (name) {
@@ -140,7 +139,7 @@ async function mapAuthorWithDBKey(mapperkey, mapper) {
   // try to map to an author
   const author = await db.get(`${mapperkey}:${mapper}`);
 
-  if (author === null) {
+  if (author == null) {
     // there is no author with this mapper, so create one
     const author = await exports.createAuthor(null);
 
@@ -163,7 +162,7 @@ async function mapAuthorWithDBKey(mapperkey, mapper) {
  * Internal function that creates the database entry for an author
  * @param {String} name The name of the author
  */
-exports.createAuthor = function (name) {
+exports.createAuthor = (name) => {
   // create the new author name
   const author = `a.${randomString(16)}`;
 
@@ -185,50 +184,40 @@ exports.createAuthor = function (name) {
  * Returns the Author Obj of the author
  * @param {String} author The id of the author
  */
-exports.getAuthor = function (author) {
-  // NB: result is already a Promise
-  return db.get(`globalAuthor:${author}`);
-};
+exports.getAuthor = (author) => db.get(`globalAuthor:${author}`);
 
 /**
  * Returns the color Id of the author
  * @param {String} author The id of the author
  */
-exports.getAuthorColorId = function (author) {
-  return db.getSub(`globalAuthor:${author}`, ['colorId']);
-};
+exports.getAuthorColorId = (author) => db.getSub(`globalAuthor:${author}`, ['colorId']);
 
 /**
  * Sets the color Id of the author
  * @param {String} author The id of the author
  * @param {String} colorId The color id of the author
  */
-exports.setAuthorColorId = function (author, colorId) {
-  return db.setSub(`globalAuthor:${author}`, ['colorId'], colorId);
-};
+exports.setAuthorColorId = (author, colorId) => db.setSub(
+    `globalAuthor:${author}`, ['colorId'], colorId);
 
 /**
  * Returns the name of the author
  * @param {String} author The id of the author
  */
-exports.getAuthorName = function (author) {
-  return db.getSub(`globalAuthor:${author}`, ['name']);
-};
+exports.getAuthorName = (author) => db.getSub(`globalAuthor:${author}`, ['name']);
 
 /**
  * Sets the name of the author
  * @param {String} author The id of the author
  * @param {String} name The name of the author
  */
-exports.setAuthorName = function (author, name) {
-  return db.setSub(`globalAuthor:${author}`, ['name'], name);
-};
+exports.setAuthorName = (author, name) => db.setSub(`globalAuthor:${author}`, ['name'], name);
 
 /**
  * Returns an array of all pads this author contributed to
  * @param {String} author The id of the author
  */
-exports.listPadsOfAuthor = async function (authorID) {
+exports.listPadsOfAuthor = async (authorID) => {
   /* There are two other places where this array is manipulated:
    * (1) When the author is added to a pad, the author object is also updated
    * (2) When a pad is deleted, each author of that pad is also updated
@@ -237,9 +226,9 @@ exports.listPadsOfAuthor = async function (authorID) {
   // get the globalAuthor
   const author = await db.get(`globalAuthor:${authorID}`);
 
-  if (author === null) {
+  if (author == null) {
     // author does not exist
-    throw new customError('authorID does not exist', 'apierror');
+    throw new CustomError('authorID does not exist', 'apierror');
   }
 
   // everything is fine, return the pad IDs
@@ -253,11 +242,11 @@ exports.listPadsOfAuthor = async function (authorID) {
  * @param {String} author The id of the author
  * @param {String} padID The id of the pad the author contributes to
  */
-exports.addPad = async function (authorID, padID) {
+exports.addPad = async (authorID, padID) => {
   // get the entry
   const author = await db.get(`globalAuthor:${authorID}`);
 
-  if (author === null) return;
+  if (author == null) return;
 
   /*
    * ACHTUNG: padIDs can also be undefined, not just null, so it is not possible
@@ -280,12 +269,12 @@ exports.addPad = async function (authorID, padID) {
  * @param {String} author The id of the author
  * @param {String} padID The id of the pad the author contributes to
  */
-exports.removePad = async function (authorID, padID) {
+exports.removePad = async (authorID, padID) => {
   const author = await db.get(`globalAuthor:${authorID}`);
 
-  if (author === null) return;
+  if (author == null) return;
 
-  if (author.padIDs !== null) {
+  if (author.padIDs != null) {
     // remove pad from author
     delete author.padIDs[padID];
     await db.set(`globalAuthor:${authorID}`, author);