Merge branch 'fix-sanitize-dfn' into 'master'

sanitize: allow <dfn> tag

### In brief
* Add `<dfn>` tag to allowed tags list
  * `<dfn>` represents the defining instance of a term in HTML
  * More [information about `<dfn>` on the w3school's website](http://www.w3schools.com/tags/tag_dfn.asp )

### Example
This stops article content such as...
```
Indian tea harvests are divided up by <dfn>flush</dfn>.
```
...from getting turned into...
```
Indian tea harvests are divided up by .
```

See merge request !45

diff --git a/include/functions2.php b/include/functions2.php
index f0e352ed100cf47692b8dfe6c719fed16f083fbc..ff4ac2c771f358fec01c23b630889a188f9d7154 100644 (file)
--- a/include/functions2.php
+++ b/include/functions2.php
@@ -978,7 +978,7 @@
                $allowed_elements = array('a', 'address', 'acronym', 'audio', 'article', 'aside',
                        'b', 'bdi', 'bdo', 'big', 'blockquote', 'body', 'br',
                        'caption', 'cite', 'center', 'code', 'col', 'colgroup',
-                       'data', 'dd', 'del', 'details', 'description', 'div', 'dl', 'font',
+                       'data', 'dd', 'del', 'details', 'description', 'dfn', 'div', 'dl', 'font',
                        'dt', 'em', 'footer', 'figure', 'figcaption',
                        'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'header', 'html', 'i',
                        'img', 'ins', 'kbd', 'li', 'main', 'mark', 'nav', 'noscript',