I want to change the toolbar limiter and to insert "per page" text inside <option> tag.

<div class="limiter">
    <label class="label" for="limiter">
        <span><?= /* @escapeNotVerified */ __('Show') ?></span>
    </label>
    <div class="control">
        <select id="limiter" data-role="limiter" class="limiter-options">
            <?php foreach ($block->getAvailableLimit() as $_key => $_limit): ?>
                <option value="<?= /* @escapeNotVerified */ $_key ?>"<?php if ($block->isLimitCurrent($_key)): ?>
                    selected="selected"<?php endif ?>>
                    <?= /* @escapeNotVerified */ $_limit ?>
                </option>
            <?php endforeach; ?>
        </select>
    </div>
    <span class="limiter-text"><?= /* @escapeNotVerified */ __('per page') ?></span>
</div>

I add this pages on my custom theme but even if I change something the changes are not displayed.

app/design/frontend/MyTheme/default/Magento_Theme/templates/html/pager.phtml
app/design/frontend/MyTheme/default/Magento_Catalog/template/product/list/toolbar/limiter.phtml

I need to add changes in other file?

I want to change the toolbar limiter and to insert "per page" text inside <option> tag.

<div class="limiter">
    <label class="label" for="limiter">
        <span><?= /* @escapeNotVerified */ __('Show') ?></span>
    </label>
    <div class="control">
        <select id="limiter" data-role="limiter" class="limiter-options">
            <?php foreach ($block->getAvailableLimit() as $_key => $_limit): ?>
                <option value="<?= /* @escapeNotVerified */ $_key ?>"<?php if ($block->isLimitCurrent($_key)): ?>
                    selected="selected"<?php endif ?>>
                    <?= /* @escapeNotVerified */ $_limit ?>
                </option>
            <?php endforeach; ?>
        </select>
    </div>
    <span class="limiter-text"><?= /* @escapeNotVerified */ __('per page') ?></span>
</div>

I add this pages on my custom theme but even if I change something the changes are not displayed.

app/design/frontend/MyTheme/default/Magento_Theme/templates/html/pager.phtml
app/design/frontend/MyTheme/default/Magento_Catalog/template/product/list/toolbar/limiter.phtml

I need to add changes in other file?