Before, the only searched picture tag was 'name', which corresponds to the file
name of the image added to the docx. Also searching in title and description tags
makes creating docx templates to be rendered by this more flexible and easier
in document editors which do not support viewing the image's original filename,
such as Google Docs.
Also, picture replacement was comprised of picture map creation and picture
replacing. Both processes were merged in order to implement the above change
more easily.
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