zulip/static/templates/settings/emoji_settings_tip.hbs

{{#if is_guest}}
    <div class='tip'>{{t "Guests cannot edit custom emoji." }}</div>
{{else}}
    {{#if realm_add_emoji_by_admins_only}}
    <div class='tip'>{{t "Only organization administrators can add custom emoji in this organization." }}</div>
    {{else}}
    <div class='tip'>{{t "Any member of this organization can add custom emoji." }}</div>
    {{/if}}
{{/if}}