Improvements on budget results view & table

[bertocq]

Where

• Related PR's: Budget results urls AyuntamientoMadrid/consul#850

What

Backport improvements done on Madrid's fork to the Budget Results page and investments table:

• Using an instance variable instead of params to show what is the current heading
• Order budget headings by id (asc)
• Improve budget results title
• Fallback to first budget's heading if none is passed by param on url

How

Manually merging relevant and compatible changes from that PR

Screenshots

Test

• Checking the current heading link has the active css class, and its by default the first budget heading.

Deployment

• As usual

Warnings

• Still missing the Budget Stats part... will come back later for it