Track errors when uploading spreadsheets

Uses the new javascript event tracking stuff so that we can see what
errors people are getting when they upload spreadsheets.

app/assets/javascripts/errorTracking.js

@@ -1,7 +1,7 @@
 (function(Modules) {
   "use strict";
 
-  Modules.TrackEvent = function() {
+  Modules.TrackError = function() {
 
     this.start = function(component) {
 

app/templates/partials/check/not-allowed-to-send-to.html

@@ -1,4 +1,4 @@
-<h1 class='banner-title'>
+<h1 class='banner-title' data-module="track-error" data-error-type="Trial mode: bad recipients" data-error-label="{{ upload_id }}">
   You can’t send to
   {{ 'this' if count_of_recipients == 1 else 'these' }}
   {{ template_type_label }}

app/templates/partials/check/too-many-messages.html

@@ -1,4 +1,4 @@
-<h1 class='banner-title'>
+<h1 class='banner-title' data-module="track-error" data-error-type="Trial mode: too many recipients" data-error-label="{{ upload_id }}">
   {% if original_file_name %}
     Too many recipients
   {% else %}

app/templates/views/check/column-errors.html

@@ -24,7 +24,7 @@
 
       {% if recipients.too_many_rows %}
 
-        <h1 class='banner-title'>
+        <h1 class='banner-title' data-module="track-error" data-error-type="Too many rows" data-error-label="{{ upload_id }}">
           Your file has too many rows
         </h1>
         <p>
@@ -35,7 +35,7 @@
 
       {% elif not count_of_recipients %}
 
-        <h1 class='banner-title'>
+        <h1 class='banner-title' data-module="track-error" data-error-type="No rows" data-error-label="{{ upload_id }}">
           Your file is missing some rows
         </h1>
         <p>
@@ -47,7 +47,7 @@
 
       {% elif not recipients.has_recipient_columns %}
 
-        <h1 class='banner-title'>
+        <h1 class='banner-title' data-module="track-error" data-error-type="Missing recipient columns" data-error-label="{{ upload_id }}">
           Your file needs {{ recipients.recipient_column_headers | formatted_list(
             prefix='a column called',
             prefix_plural='columns called'
@@ -62,7 +62,7 @@
 
       {% elif recipients.missing_column_headers %}
 
-        <h1 class='banner-title'>
+        <h1 class='banner-title' data-module="track-error" data-error-type="Missing placeholder columns" data-error-label="{{ upload_id }}">
           The columns in your file need to match the double brackets in
           your template
         </h1>

app/templates/views/check/row-errors.html

@@ -22,7 +22,7 @@
   <div class="bottom-gutter">
     {% call banner_wrapper(type='dangerous') %}
       {% if row_errors|length == 1 %}
-        <h1 class='banner-title'>
+        <h1 class='banner-title' data-module="track-error" data-error-type="Bad rows" data-error-label="{{ upload_id }}">
           There is a problem with your data
         </h1>
         <p>