Add language select menu in webgui (fixes #981)

gui/assets/css/overrides.css

@@ -153,6 +153,45 @@ table.table-condensed td {
     padding-right: 15px;
 }
 
+
+/**
+ * Menu for select language
+ */
+
+@media (min-width:480px) {
+    *[language-select] > .dropdown-menu > li {
+        width: 50%;
+        float: left;
+    }
+    *[language-select] > .dropdown-menu {
+        width: 400px;
+    }
+}
+
+@media (max-width:479px) {
+    .dropdown-menu {
+        padding-top: 55px;
+    }
+
+    *[language-select] > .dropdown-toggle {
+        font-size: 14px;
+    }
+
+    .dropdown-toggle {
+        float: left;
+    }
+
+    .navbar-brand {
+        padding-left: 0;
+        padding-top: 16px;
+    }
+
+    .navbar-nav .open .dropdown-menu > li > a {
+        padding: 12px 15px 12px 25px;
+    }
+}
+
+
 .panel-body .table-condensed {
     margin-bottom: 0;
 }