zulip/static/templates/default_language_modal.hbs

<div id="{{prefix}}default_language_modal" class="modal hide modal-bg fade default_language_modal" tabindex="-1" role="dialog"
  aria-labelledby="{{prefix}}default_language_modal_label" aria-hidden="true">
    <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="{{t 'Close' }}"><span aria-hidden="true">&times;</span></button>
        <h3 id="{{prefix}}default_language_modal_label">{{t "Select default language" }}</h3>
    </div>
    <div class="modal-body">
        <p>
            {{#tr}}
            A language is marked as 100% translated only if every string in the web, desktop,
            and mobile apps is translated, including administrative UI and error messages.
            {{/tr}}
        </p>
        <p>
            {{#tr}}
                Zulip's translations are contributed by our amazing community of volunteer
                translators. If you'd like to help, see the
                <z-link>Zulip translation guidelines</z-link>.
                {{#*inline "z-link"}}<a target="_blank" rel="noopener noreferrer" href="https://zulip.readthedocs.io/en/latest/translating/translating.html">{{> @partial-block}}</a>{{/inline}}
            {{/tr}}
        </p>
        <div>
            <table>
                {{#each language_list}}
                <tr>
                    <td>
                        <a class="language" data-code="{{this.first.code}}" data-name="{{this.first.name}}">
                            {{#if this.first.selected}}
                            <b>{{this.first.name_with_percent}}</b>
                            {{else}}
                            {{this.first.name_with_percent}}
                            {{/if}}
                        </a>
                    </td>
                    <td>
                        <a class="language" data-code="{{this.second.code}}" data-name="{{this.second.name}}">
                            {{#if this.second.selected}}
                            <b>{{this.second.name_with_percent}}</b>
                            {{else}}
                            {{this.second.name_with_percent}}
                            {{/if}}
                        </a>
                    </td>
                </tr>
                {{/each}}
            </table>
        </div>
    </div>
    <div class="modal-footer">
        <button class="btn btn-primary" data-dismiss="modal">{{t "Close" }}</button>
    </div>
</div>