Localizes the pen extension:
- loads all pen locale information - may want to consider dynamically loading locales later.

The VM refreshWorkspace will eventually lead back to onWorkspaceUpdate,
which will call refreshSelection itself.

This reverts commit 5b9e8aa0, reversing
changes made to 4cb65dc5.

To prevent loading scratch-blocks default toolbox

Also, delete `static-blocks.xml` which shouldn't have been added in the
first place.

This shouldn't be required.