diff --git a/lib/jquery.uls/i18n/en-gb.json b/lib/jquery.uls/i18n/en-gb.json
deleted file mode 100644
index 7b4e801b..00000000
--- a/lib/jquery.uls/i18n/en-gb.json
+++ /dev/null
@@ -1,22 +0,0 @@
-{
-	"@metadata": {
-		"authors": [
-			"Andibing",
-			"Chase me ladies, I'm the Cavalry"
-		]
-	},
-	"uls-region-WW": "Worldwide",
-	"uls-region-SP": "Special",
-	"uls-region-AM": "America",
-	"uls-region-AF": "Africa",
-	"uls-region-EU": "Europe",
-	"uls-region-AS": "Asia",
-	"uls-region-ME": "Middle East",
-	"uls-region-PA": "Pacific",
-	"uls-region-all": "All languages",
-	"uls-no-results-found": "No results found",
-	"uls-common-languages": "Suggested languages",
-	"uls-no-results-suggestion-title": "You may be interested in:",
-	"uls-search-help": "You can search by language name, script name, ISO code of language or you can browse by region.",
-	"uls-search-placeholder": "Search for a language"
-}
diff --git a/lib/jquery.uls/i18n/mnc-mong.json b/lib/jquery.uls/i18n/mnc-mong.json
new file mode 100644
index 00000000..8176de54
--- /dev/null
+++ b/lib/jquery.uls/i18n/mnc-mong.json
@@ -0,0 +1,11 @@
+{
+	"@metadata": {
+		"authors": [
+			"Amire80"
+		]
+	},
+	"uls-region-AM": "᠇ᠮᡝᡵᡳᡴᠠ",
+	"uls-region-EU": "ᠣᡵᠣᠪᠠ",
+	"uls-region-all": "ᡝᡳ᠌ᡨᡝᠨ ᡤᡳᠰᡠᠨ",
+	"uls-no-results-suggestion-title": "ᠠᡳ᠌ᠨᠴᡳ ᠰᡳᠨᡳ ᠠᠮᡠᡵᠠᠩᡤᡝ ᠈"
+}
diff --git a/lib/jquery.uls/src/jquery.uls.lcd.js b/lib/jquery.uls/src/jquery.uls.lcd.js
index 39bf8f71..c5f5da46 100644
--- a/lib/jquery.uls/src/jquery.uls.lcd.js
+++ b/lib/jquery.uls/src/jquery.uls.lcd.js
@@ -112,8 +112,15 @@
 			if ( this.navigationIndex === null ) {
 				this.navigationIndex = 0;
 			} else {
-				this.navigationIndex++;
+				// Auto-correct the index. It has been noticed that the navigationIndex goes beyond the
+				// max index sometimes. See: phab:T328956#8854835
+				if ( this.navigationIndex > maxIndex ) {
+					this.navigationIndex = maxIndex;
+				} else {
+					this.navigationIndex++;
+				}
 			}
+
 			this.highlightLanguageOption();
 		},