docs: add maplibre-ui-translations plugin (#121)

Author: spwoodcock

README.md

@@ -172,6 +172,7 @@ are designated with a ✅, and hosted projects with a 💙.
 - [maplibre-google-streetview](https://github.com/rezw4n/maplibre-google-streetview) - Plugin that integrates Google Street View into any MapLibre map.
 - [maplibre-transition](https://github.com/popkinj/maplibre-transition) - A plugin for smooth transitions between map styles. [demo](https://observablehq.com/d/b9a97acdf712a77b)
 - [maplibre-gl-layers-control](https://github.com/mvt-proj/maplibre-gl-layers-control) - It allows to show/hide layers, opacity control and integration with legends.
+- [maplibre-ui-translations](https://github.com/spwoodcock/maplibre-ui-translations) - Community translations for the default MapLibre UI.
 
 ## Geocoding & Search Plugins
 - [mapbox.photon](https://github.com/watergis/mapbox.photon) - Adds a control to provide a geocoding feature from Photon API.