Revert "Merge branch 'adding-htmlspecialchars-to-h5p' into without-pal"

This reverts commit 687fd8ddbc256c1e8c5f3714f561c06b3c31fee1, reversing
changes made to ab1b691a27aadfc4b6a9798ca09bd2ff661f2f2f.
Revert "Merge branch 'adding-htmlspecialchars-to-h5p' into without-pal"

This reverts commit ab1b691a27aadfc4b6a9798ca09bd2ff661f2f2f, reversing
changes made to 2b12bf4441b92f6bb3f7985c7fcb36be9875d177.
Revert "Merge branch 'adding-htmlspecialchars-to-h5p' into without-pal"

This reverts commit 9f19f64baba068aee25ec2894017eb5f5e2fd733, reversing
changes made to 38c98202f48ac371d1c7ca5c81a810bd2221c44f.