client: v1.5.2; only allow number for milestone version code

client/static/js/main.js

@@ -179,6 +179,12 @@ function validateNewMilestoneForm()
         return false;
     }
 
+    if(isNaN(versionCode))
+    {
+        alert("Version Code should be a number!");
+        return false;
+    }
+
     if(isNull(versionName))
     {
         alert("Version Name shouldn't be empty!");

client/version.json

 {
     "version": {
-        "name": "v1.5.1",
-        "code": 21,
+        "name": "v1.5.2",
+        "code": 22,
         "date": "28.03.21"
     }
 }
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