Extract formatted QuantityValues from static HTML

(bug 59761)
Introducing a temporary scraping mechanism that extracts the formatted QuantityValues from the
static HTML output.
This change's intention is to alter as few code as possible since the mechanism is to be removed
as soon as the back-end is capable of properly formatting all existing DataValues and UI widgets
are initialized on top of the static HTML instead of re-constructing all HTML when initializing
the JavaScript UI.

Change-Id: Ic14001329d1ee41879efa701f8c84b46b123610e