Backport - Improve browser detection for Klar

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent/Firefox#klar_for_android
(cherry picked from commit 4cd867a36e)

test/browser-test.json

@@ -848,6 +848,16 @@
             "major"   : "2"
         }
     },
+    {
+        "desc"    : "Klar < 4.1",
+        "ua"      : "Mozilla/5.0 (Linux; Android 7.0) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Klar/1.0 Chrome/58.0.3029.83 Mobile Safari/537.36",
+        "expect"  :
+        {
+            "name"    : "Klar",
+            "version" : "1.0",
+            "major"   : "1"
+        }
+    },
     {
         "desc"    : "Konqueror",
         "ua"      : "Mozilla/5.0 (compatible; Konqueror/3.5; Linux; X11; x86_64) KHTML/3.5.6 (like Gecko) (Kubuntu)",