Fixed note title might get wrong

lib/note.js

@@ -47,6 +47,7 @@ var note = {
     checkNoteIdValid: checkNoteIdValid,
     checkNoteExist: checkNoteExist,
     getNoteTitle: getNoteTitle,
+    decodeTitle: decodeTitle,
     generateWebTitle: generateWebTitle,
     increaseViewCount: increaseViewCount,
     updatePermission: updatePermission,
@@ -96,6 +97,14 @@ function getNoteTitle(body) {
     return title;
 }
 
+// decode title
+function decodeTitle(title) {
+    var decodedTitle = LZString.decompressFromBase64(title);
+    if (decodedTitle) title = decodedTitle;
+    else title = 'Untitled';
+    return title;
+}
+
 //generate note web page title
 function generateWebTitle(title) {
     title = !title || title == "Untitled" ? "HackMD - Collaborative notes" : title + " - HackMD";