Add icon for "fuel production"

Closes #1794
Add translations for "fuel production" sidebar item

Ref #1794
Fix spec which failed depending on array order
Permit customising country name in the selection drop-down

UK, PL, and ES have had the "test" attribute removed (which had no
effect except to append "(new)" to the name in the selection drop-down).

"(Draft)/(Concept)" has been added to their names in the en_areas and
nl_areas locale files to show that they are early test versions.