zulip/static/templates/settings/playground_settings_admin.hbs

<div id="playground-settings" class="settings-section" data-name="playground-settings">
    <div class="admin-table-wrapper">
        <p>
            {{#tr}}
                Configure external code playgrounds for your Zulip organization. Code playgrounds are interactive in-browser development
                environments, such as <z-link-repl>replit</z-link-repl>, that are designed to make it convenient to edit and debug
                code. Zulip code blocks that are <z-link-markdown-help>tagged with a programming language</z-link-markdown-help> will have
                a button visible on hover that allows you to open the code block in the code playground site.
                {{#*inline "z-link-repl"}}<a href="https://replit.com/" target="_blank" rel="noopener noreferrer">{{> @partial-block}}</a>{{/inline}}
                {{#*inline "z-link-markdown-help"}}<a href="/help/format-your-message-using-markdown#code" target="_blank" rel="noopener noreferrer">{{> @partial-block}}</a>{{/inline}}
            {{/tr}}
        </p>
        <p>
            {{#tr}}
            For example, to configure code playgrounds for languages like Python or JavaScript, you could specify the <i>Language</i>
            and <i>URL Prefix</i> fields as:
            {{/tr}}
        </p>
        <ul>
            <li><code>Python</code> {{t "and" }} <code>https://replit.com/languages/python3/?code=</code></li>
            <li><code>JavaScript</code>  {{t "and" }} <code>https://replit.com/languages/javascript/?code=</code></li>
        </ul>

        {{#if is_admin}}
        <form class="form-horizontal admin-playground-form">
            <div class="add-new-playground-box grey-box">
                <div class="new-playground-form wrapper">
                    <div class="settings-section-title">
                        {{t "Add a new code playground" }}
                        {{> ../help_link_widget link="/help/add-a-custom-playground" }}
                    </div>
                    <div class="alert" id="admin-playground-status"></div>
                    <div class="control-group">
                        <label for="playground_pygments_language" class="control-label"> {{t "Language" }}</label>
                        <input type="text" id="playground_pygments_language" name="pygments_language" autocomplete="off" placeholder="Python" />
                    </div>
                    <div class="control-group">
                        <label for="playground_name" class="control-label"> {{t "Name" }}</label>
                        <input type="text" id="playground_name" name="name" placeholder="Python3 playground" />
                    </div>
                    <div class="control-group">
                        <label for="playground_url_prefix" class="control-label"> {{t "URL prefix" }}</label>
                        <input type="text" id="playground_url_prefix" name="url_prefix" placeholder="https://replit.com/languages/python3/?code=" />
                    </div>
                    <button type="submit" id="submit_playground_button" class="button rounded sea-green">
                        {{t 'Add code playground' }}
                    </button>
                </div>
            </div>
        </form>
        {{/if}}

        <input type="text" class="search" placeholder="{{t 'Filter code playgrounds' }}" aria-label="{{t 'Filter code playgrounds' }}"/>
        <div class="progressive-table-wrapper" data-simplebar>
            <table class="table table-condensed table-striped wrapped-table admin_playgrounds_table">
                <thead>
                    <th class="active" data-sort="pygments_language">{{t "Language" }}</th>
                    <th data-sort="playground_name">{{t "Name" }}</th>
                    <th data-sort="url">{{t "URL prefix" }}</th>
                    {{#if is_admin}}
                    <th class="actions">{{t "Actions" }}</th>
                    {{/if}}
                </thead>
                <tbody id="admin_playgrounds_table" class="required-text" data-empty="{{t 'No playgrounds configured.' }}"></tbody>
            </table>
        </div>
    </div>
</div>