Add more languages for list selection at install/reset time

Related issue:
- uBlockOrigin/uBlock-issues#501

Also, the handling of 3-letter language codes has been fixed.

assets/assets.json

@@ -311,7 +311,7 @@
 		"group": "regions",
 		"off": true,
 		"title": "BGR: Bulgarian Adblock list",
-		"lang": "bg",
+		"lang": "bg mk",
 		"contentURL": "https://stanev.org/abp/adblock_bg.txt",
 		"supportURL": "https://stanev.org/abp/"
 	},
@@ -387,7 +387,7 @@
 		"group": "regions",
 		"off": true,
 		"title": "FRA: EasyList Liste FR",
-		"lang": "ar fr",
+		"lang": "ar br fr oc",
 		"contentURL": "https://easylist-downloads.adblockplus.org/liste_fr.txt",
 		"supportURL": "https://forums.lanik.us/viewforum.php?f=91"
 	},
@@ -514,7 +514,7 @@
 		"group": "regions",
 		"off": true,
 		"title": "NLD: EasyList Dutch",
-		"lang": "nl",
+		"lang": "af fy nl",
 		"contentURL": "https://easylist-downloads.adblockplus.org/easylistdutch.txt",
 		"supportURL": "https://forums.lanik.us/viewforum.php?f=100"
 	},
@@ -566,7 +566,7 @@
 		"group": "regions",
 		"off": true,
 		"title": "RUS: RU AdList",
-		"lang": "be ru uk",
+		"lang": "be kk ru uk uz",
 		"contentURL": "https://easylist-downloads.adblockplus.org/advblock+cssfixes.txt",
 		"supportURL": "https://forums.lanik.us/viewforum.php?f=102",
 		"instructionURL": "https://forums.lanik.us/viewtopic.php?f=102&t=22512"
@@ -576,7 +576,7 @@
 		"group": "regions",
 		"off": true,
 		"title": "RUS: AdGuard Russian filter",
-		"lang": "be ru uk",
+		"lang": "be kk ru uk uz",
 		"contentURL": "https://filters.adtidy.org/extension/ublock/filters/1.txt",
 		"supportURL": "https://forum.adguard.com/forumdisplay.php?69-%D0%A4%D0%B8%D0%BB%D1%8C%D1%82%D1%80%D1%8B-Adguard",
 		"instructionURL": "https://kb.adguard.com/ru/general/adguard-ad-filters#russian"
@@ -586,7 +586,7 @@
 		"group": "regions",
 		"off": true,
 		"title": "spa: EasyList Spanish",
-		"lang": "es",
+		"lang": "an ast ca es eu gl",
 		"contentURL": "https://easylist-downloads.adblockplus.org/easylistspanish.txt",
 		"supportURL": "https://forums.lanik.us/viewforum.php?f=103"
 	},
@@ -595,7 +595,7 @@
 		"group": "regions",
 		"off": true,
 		"title": "spa, por: AdGuard Spanish/Portuguese filter",
-		"lang": "es pt",
+		"lang": "an ast ca es eu gl pt",
 		"contentURL": "https://filters.adtidy.org/extension/ublock/filters/9.txt",
 		"supportURL": "https://github.com/AdguardTeam/AdguardFilters#adguard-filters",
 		"instructionURL": "https://kb.adguard.com/en/general/adguard-ad-filters"

src/js/storage.js

@@ -1248,19 +1248,21 @@
 //   Support ability to auto-enable a filter list based on user agent.
 
 µBlock.listMatchesEnvironment = function(details) {
-    var re;
     // Matches language?
     if ( typeof details.lang === 'string' ) {
-        re = this.listMatchesEnvironment.reLang;
+        let re = this.listMatchesEnvironment.reLang;
         if ( re === undefined ) {
-            re = new RegExp('\\b' + self.navigator.language.slice(0, 2) + '\\b');
-            this.listMatchesEnvironment.reLang = re;
+            const match = /^[a-z]+/.exec(self.navigator.language);
+            if ( match !== null ) {
+                re = new RegExp('\\b' + match[0] + '\\b');
+                this.listMatchesEnvironment.reLang = re;
+            }
         }
-        if ( re.test(details.lang) ) { return true; }
+        if ( re !== undefined && re.test(details.lang) ) { return true; }
     }
     // Matches user agent?
     if ( typeof details.ua === 'string' ) {
-        re = new RegExp('\\b' + this.escapeRegex(details.ua) + '\\b', 'i');
+        let re = new RegExp('\\b' + this.escapeRegex(details.ua) + '\\b', 'i');
         if ( re.test(self.navigator.userAgent) ) { return true; }
     }
     return false;