See https://www.woltlab.com/community/thread/301190-mb-strpos-is-not-an-allowed-template-modifier/
<input type="radio" id="{$option->optionName}_no"{if $value == 0} checked{/if} name="values[{$option->optionName}]" value="0"{if $disableOptions || $enableOptions} class="jsEnablesOptions" data-is-boolean="true" data-disable-options="[ {@$disableOptions}]" data-enable-options="[ {@$enableOptions}]"{/if}>
<label for="{$option->optionName}_no" class="red">{icon name='xmark'} {lang}wcf.acp.option.type.boolean.no{/lang}</label>
</li>
- {if $option->optionName|mb_strpos:'admin.' !== 0 && ($group === null || (!$group->isEveryone() && !$group->isUsers()))}
+ {if $option->optionName|str_starts_with:'admin.' && ($group === null || (!$group->isEveryone() && !$group->isUsers()))}
<li>
<input type="radio" id="{$option->optionName}_never"{if $value == -1} checked{/if} name="values[{$option->optionName}]" value="-1"{if $disableOptions || $enableOptions} class="jsEnablesOptions" data-is-boolean="true" data-disable-options="[ {@$disableOptions}]" data-enable-options="[ {@$enableOptions}]"{/if}>
<label for="{$option->optionName}_never" class="yellow">{icon name='ban'} {lang}wcf.acp.option.type.boolean.never{/lang}</label>