security: increase minimum password length from 8 to 12 characters

src/popup/views/addWallet.js

@@ -49,8 +49,8 @@ function init(ctx) {
             showFlash("Please choose a password.");
             return;
         }
-        if (pw.length < 8) {
-            showFlash("Password must be at least 8 characters.");
+        if (pw.length < 12) {
+            showFlash("Password must be at least 12 characters.");
             return;
         }
         if (pw !== pw2) {