Motivation / Problem

Found a boo-boo while looking at a screenshot. Go figure.

In the menu it is called "Online Players".
In the caption it is called "Multiplayer".

That is just confusing. A window should have a single identity, not two.

Description

Renamed the caption, as I think "Online Players" is a more clear description.

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