Support {{!}} magic template

[lasconic]

• Wiktionary page: https://fr.wiktionary.org/wiki/cacox%C3%A9nite

Wikicode:

{{!}}

Output:

depends on the language. In french: ! 

Expected:

|

---

Model link, if any: https://www.mediawiki.org/wiki/Help:Magic_words#Other

[lasconic]

Again not the most elegant bug fix in history.... but {{!}} needs to be tacked at the very end or the pipe | will be parsed away...