Add more new icons

Add new icons for the apps: Document comments, documents, file metadata,
parsing and OCR.

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

mayan/apps/document_comments/icons.py

@@ -3,4 +3,8 @@ from __future__ import absolute_import, unicode_literals
 from mayan.apps.appearance.classes import Icon
 
 icon_comments_for_document = Icon(driver_name='fontawesome', symbol='comment')
-icon_comment_add = Icon(driver_name='fontawesome', symbol='plus')
+icon_comment_add = Icon(
+    driver_name='fontawesome-dual', primary_symbol='comment',
+    secondary_symbol='plus'
+)
+icon_comment_delete = Icon(driver_name='fontawesome', symbol='times')