Use of append() in EditorContainer.js

[philipjohn]

Similar to #526 we need to review the usage of .append() to ensure that the output is adequately escaped.

FILE: /home/philipjohn/plugins/liveblog/src/react/containers/EditorContainer.js
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FOUND 3 ERRORS AFFECTING 3 LINES
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 202 | ERROR | Any HTML passed to `append` gets executed. Make sure it's properly escaped.
     |       | (WordPressVIPMinimum.JS.HTMLExecutingFunctions.append)
 204 | ERROR | Any HTML passed to `append` gets executed. Make sure it's properly escaped.
     |       | (WordPressVIPMinimum.JS.HTMLExecutingFunctions.append)
 205 | ERROR | Any HTML passed to `append` gets executed. Make sure it's properly escaped.
     |       | (WordPressVIPMinimum.JS.HTMLExecutingFunctions.append)
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Time: 7.59 secs; Memory: 22Mb