Jupyter/IPython get the tick `'` back to pass it to Katex
What does this MR do?
Get the tick ' back to pass it to Katex
When rendering IPython notebook markdown cells the formulas are passed
to Katex. Before that the raw string is passed to marked.js to handle
HTML forbidden characters. One of these characters is the '. This
character is often used in math formulas and the replacement ' is
not well received by Katex.
Fixes: #216744 (closed)
Screenshots
Formula with ' is now rendered. Listitems not yet, comes in another MR
