ThemeShock

<p>Custom 404, helps you customize your 404.<br />
From the dashboard options you’re able to modify the background, the image and the fonts color and style.</p>
<p>This page will show users the last post on your site, so that they may choose to follow one of this instead of leaving your page.</p>
<h3>Features</h3>
<ul>
<li>Customizable background</li>
<li>Several Patterns</li>
<li>Multiple fonts</li>
<li>24 additional images.</li>
<li>5 Different languages</li>
</ul>


Custom 404 Error Page: Unilimited designs and colors

Custom 404, creates a 404 page that is set to the default one of your WordPress installation.
This page is fully customizable from the dashboard.

Zbynek Nedoma

<p>This plugin allows you to set custom error messages for Gravity Forms inputs. We support messages for Required, Unique and Email Validation errors.</p>
<h4>Links</h4>
<ul>
<li><a href="https://domaneni.cz/gfcem/" rel="nofollow ugc">Website</a></li>
<li><a href="https://ko-fi.com/domaneni" rel="nofollow ugc">Support</a></li>
</ul>
<h3>Documentation</h3>
<h4>How to use form global settings</h4>
<p>In the settings of each form, you will find the <strong>Custom Error Message</strong> section. Here you can enable them for the entire form and set the default messages to be used for supported fields.</p>
<h4>How to use form field settings</h4>
<p>Use this option if you need to set a custom error message only for a specific field or to override the default message. Go to the <strong>Advanced</strong> Field Settings tab and you will find the <strong>Allow custom error messages</strong> checkbox. Once enabled, you can set a custom message for this field.</p>


Custom Error Messages for Gravity Forms

Adds custom error messages to Gravity Forms inputs

Custom 404 Error Page: Unilimited designs and colors vs Custom Error Messages for Gravity Forms