title: django: part of javascript translation doesnot work
body: <p>here is my code:</p>
  <pre><code> var text = `&lt;div id='weather_data'&gt;
              &lt;img id='weather_icon' src='${weather_icon}'&gt;
              &lt;span id='centered'&gt;${data[0].temperature}°c&lt;/span&gt;
              &lt;/div&gt;
              &lt;h2&gt;Steps:&lt;/h2&gt;
              &lt;ul id='journey_info'&gt;`;
  </code></pre>
  <p>and</p>
  <pre><code> text +=
                  &quot;&lt;li&gt;&quot; +
                  gettext(&quot; Start from: &quot;) +
                  &quot;&lt;br&gt;&quot; +
                  data[i].start_name +
                  &quot;&lt;br&gt;&quot; +
                  &quot;&lt;br&gt;&quot; +
                  gettext(&quot; Line ID: &quot;) +
                  line_id +
                  &quot;&lt;br&gt;&quot; +
                  &quot;&lt;br&gt;&quot; +
                  gettext(&quot; Departs at: &quot;) +
                  getTime(data, i) +
                  `&lt;div id='arrival_${stop_id}'&gt;&lt;/div&gt;` +
                  &quot;&lt;br&gt;&quot; +
                  gettext(&quot; Arrives to: &quot;) +
                  &quot;&lt;br&gt;&quot; +
                  data[i].end_name +
                  &quot;&lt;br&gt;&quot; +
                  &quot;&lt;br&gt;&quot; +
                  gettext(&quot; Stops: &quot;) +
                  data[i].num_stops +
                  &quot; • &quot; +
                  data[i].travel_time +
                  &quot;mins &lt;span id='arrow'&gt;&amp;#9660&lt;/span&gt;&quot; +
                  &quot;&lt;div id='directions_stops_list'&gt;&quot;;
  </code></pre>
  <p>in my <em>djangojs.po</em> file,
  there are only :</p>
  <pre><code>#: .\static\javascript\modals.js:49
  msgid &quot; Arrives to: &quot;
  msgstr &quot; 到达：&quot;
  
  #: .\static\javascript\modals.js:54
  msgid &quot; Stops: &quot;
  msgstr &quot;站点：&quot;
  </code></pre>
  <p>so part of gettext are found by django.
  but Why can't it read: gettext(&quot; Start from: &quot;),gettext(&quot; Line ID: &quot;) and gettext(&quot; Departs at: &quot;)?</p>
  <p><strong>Notice:</strong> any code between <code>var text =</code> and <code> `&lt;div id='arrival_${stop_id}'&gt;&lt;/div&gt;` +</code> couldnot be recognized by <strong>gettext</strong>.</p>