"Vehicles" is just "fordon", "vägfordon" means "road vehicles"

Motivation / Problem

In the performance dropdown in Swedish, it says "vägfordon" (which means "road vehicles") when in fact it's referring to all vehicles, not just road vehicles.

Description

I simply changed the word "vägfordon" to "fordon" in the translation file.

Limitations

This is a very simple fix so there shouldn't be any limitations.

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

• The bug fix is important enough to be backported? (label: 'backport requested')
• This PR affects the save game format? (label 'savegame upgrade')
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, gs_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • newgrf_debug_data.h may need updating.
  • PR must be added to API tracker