Luxembourgish translation (#6131)

* Luxembourgish translation

* Fixed linting issue in luxembourgish translation

src/js/select2/i18n/lb.js

@@ -0,0 +1,41 @@
+define(function () {
+    // Luxembourgish
+    return {
+      errorLoading: function () {
+        return 'D\'Resultater konnten net geluede ginn.';
+      },
+      inputTooLong: function (args) {
+        var overChars = args.input.length - args.maximum;
+  
+        return 'Läscht ' + overChars + ' Schrëftzeechen';
+      },
+      inputTooShort: function (args) {
+        var remainingChars = args.minimum - args.input.length;
+  
+        return 'Tippt mindestens ' + remainingChars + ' Schrëftzeechen an';
+      },
+      loadingMore: function () {
+        return 'Méi Resultater lueden…';
+      },
+      maximumSelected: function (args) {
+        return 'Dir kennt nëmmen ' + args.maximum + ' Element' +
+          ((args.maximum > 1) ? 'er' : '') + ' auswielen';
+      },
+      noResults: function () {
+        return 'Keng Resultater fonnt';
+      },
+      searching: function () {
+        return 'Sichen…';
+      },
+      removeAllItems: function () {
+        return 'All Elementer läschen';
+      },
+      removeItem: function () {
+        return 'Element läschen';
+      },
+      search: function() {
+        return 'Sichen';
+      }
+    };
+  });
+