LanguageMarker

New
- Added invisible addon-to-addon language propagation for nearby players.
- LanguageMarker can now quietly check whether nearby players also use the addon and request their configured language through the addon channel.
- If no manual language is configured, the addon now falls back to the player's client language automatically.

Changed
- Nearby propagation requests are only sent for players not already stored in your known player list.
- Added an "Automatic (Client language)" option for your own language setting.

Improved
- Propagated language detections now show "Propagation" as the auto-detect reason.
- Added request throttling to avoid repeated addon whispers to the same nearby player.