Add worldwide monolingual layer as default when language matches (#205)

layers/config/config.js

@@ -2,12 +2,18 @@ BR.confLayers = {};
 
 BR.confLayers.defaultBaseLayers = [
     'standard',
-    'osm-mapnik-german_style',
     'OpenTopoMap',
     'Stamen.Terrain',
     'Esri.WorldImagery'
 ];
 
+// worldwide monolingual layers to add as default when browser language matches
+BR.confLayers.languageDefaultLayers = [
+    'osm-mapnik-german_style',
+    'osmfr',
+    '1021' // sputnik.ru
+];
+
 BR.confLayers.defaultOverlays =  [
     'HikeBike.HillShading',
     'Waymarked_Trails-Cycling',