just some comments

javascript/src/Plugins/qfq.fabric.js

 /**
- * Created by bbaer on 5/5/17.
+ * @author Benjamin Baer <benjamin.baer@math.uzh.ch>
+ *
+ * qfq.fabric.js: Integrates a callable fabric.js html5 canvas.
+ * Currently in development for a special case, may be expanded
+ * and integrated into qfq.
+ *
+ * Buttons and color switches are generated on basis of a json.
+ * May be expanded to make it easy to create new brushes and stuff.
+ * 
+ * Probably will soon open up "easy" ways for you to create plugins
+ * that integrate into the qfq js client.
+ *
  */
 
 var QfqNS = QfqNS || {};
@@ -32,11 +43,12 @@ $(function (n) {
         this.origX = 0;
         this.origY = 0;
 
+        // Handles button states and generation of said buttons. Should be renamed.
         function ModeSettings() {
-            this.qFabric;
+            this.qFabric = {};
             this.myButtons = [];
             this.myColors = [];
-            this.myModes = {modes: [], currentMode: ""};
+            this.myModes = {modes: [], currentMode: "", colors: []};
         }
 
         ModeSettings.prototype.initialize = function(qfqFabric, uri) {
@@ -367,7 +379,7 @@ $(function (n) {
     };
 
     // Calls additional functions on button press, could eventually be integrated to
-    // the button json
+    // the button/mode json
     n.Fabric.prototype.buttonPress = function(string, $button) {
         this.modeSettings.activateMode(string, $button);
         switch(string) {
@@ -420,8 +432,7 @@ $(function (n) {
     n.fabric = new n.Fabric();
     n.fabric.setBackground("../mockup/mockData/Scan2a.jpeg");
 
-    // Will be integrated shortly
-
+    // Will be integrated shortly or scrapped entirely.
     $("#text-bg-submit").on("click", function() {
         n.fabric.userText = $("#text-user-value").val();
         n.fabric.drawTextBoxMode = true;
@@ -430,7 +441,7 @@ $(function (n) {
 
     /*
     To be integrated, save to localstorage & at the and as ajax to server.
-    Export to image is a maybe.
+    Export to image is a maybe. Mainly here for future reference.
 
     $("#save1").on("click", function() {
         if (!n.fabric.saveOne) {