Footnotes cutting off text with apostrophes and not replacing & with &

Problem/Motivation

The footnotes module cuts off any footnote with an apostrophe in it and also doesn't replace & with an &.

Steps to reproduce

Create a footnote with an apostrophe in the text and an &.

Proposed resolution

Adding in a str_replace to replace ' with ' and then uses str_replace to replace ' and & with a ' and & respectively.

Remaining tasks

User interface changes

API changes

Data model changes