fix #2344

assets/assets.json

@@ -529,7 +529,7 @@
 		"group": "regions",
 		"off": true,
 		"title": "RUS: RU AdList (Дополнительная региональная подписка)",
-		"lang": "ru",
+		"lang": "be ru uk",
 		"contentURL": "https://easylist-downloads.adblockplus.org/advblock.txt",
 		"supportURL": "https://forums.lanik.us/viewforum.php?f=102"
 	},

src/js/storage.js

@@ -430,8 +430,7 @@
 /******************************************************************************/
 
 µBlock.autoSelectRegionalFilterLists = function(lists) {
-    var lang = self.navigator.language.slice(0, 2),
-        selectedListKeys = [ this.userFiltersPath ],
+    var selectedListKeys = [ this.userFiltersPath ],
         list;
     for ( var key in lists ) {
         if ( lists.hasOwnProperty(key) === false ) { continue; }
@@ -440,7 +439,7 @@
             selectedListKeys.push(key);
             continue;
         }
-        if ( list.lang === lang ) {
+        if ( this.matchCurrentLanguage(list.lang) ) {
             selectedListKeys.push(key);
             list.off = false;
         }
@@ -1135,7 +1134,7 @@
         if ( details.entry.content === 'filters' ) {
             if (
                 details.entry.off !== true ||
-                self.navigator.language.startsWith(details.entry.lang)
+                this.matchCurrentLanguage(details.entry.lang)
             ) {
                 this.saveSelectedFilterLists([ details.assetKey ], true);
             }

src/js/utils.js

@@ -245,3 +245,15 @@
 };
 
 /******************************************************************************/
+
+// https://github.com/gorhill/uBlock/issues/2344
+
+µBlock.matchCurrentLanguage = function(s) {
+    if ( typeof s !== 'string' ) { return false; }
+    if ( this.matchCurrentLanguage.reLang === undefined ) {
+        this.matchCurrentLanguage.reLang = new RegExp('\\b' + self.navigator.language.slice(0, 2) + '\\b');
+    }
+    return this.matchCurrentLanguage.reLang.test(s);
+};
+
+/******************************************************************************/