Add info for input fields

package.json

@@ -1,6 +1,6 @@
 {
     "name": "interlanguage-checker",
-    "version": "1.4.0",
+    "version": "1.4.2",
     "description": "Check the consistency of MediaWiki interlanguage links in a simple overview.",
     "author": "Felix W. Dekker",
     "browser": "bundle.js",

src/main/index.html

@@ -44,10 +44,10 @@
         <div class="row">
             <div class="column">
                 <form>
-                    <label for="url">URL</label>
+                    <label for="url">URL&nbsp;<i class="fa fa-question-circle-o" title="The URL to the wiki's API"></i></label>
                     <input id="url" type="url" value="https://fallout.fandom.com/api.php" />
 
-                    <label for="page">Page</label>
+                    <label for="page">Page&nbsp;<i class="fa fa-question-circle-o" title="The title of the page to check"></i></label>
                     <input id="page" type="text" autofocus />
                     <br />
                     <button id="check" type="button">Check</button>