fix "pading-right" [sic] typo in dashboard.css; fixes #12455
Downgrade holder.js to v2.2.0.

Fixes #12440.
Merge pull request #12463 from XhmikosR/12440

Downgrade holder.js to v2.2.0.
Merge commit '40d3cf6cd7b28be2eb95c3f43fa9e5d493ecafce'