Support deleting the parsed content of a document

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/document_parsing/icons.py

@@ -3,6 +3,11 @@ from __future__ import absolute_import, unicode_literals
 from mayan.apps.appearance.classes import Icon
 
 icon_document_content = Icon(driver_name='fontawesome', symbol='font')
+icon_document_content_delete = Icon(
+    driver_name='fontawesome-dual',
+    primary_symbol='font',
+    secondary_symbol='minus'
+)
 icon_document_parsing_errors_list = Icon(
     driver_name='fontawesome', symbol='font'
 )