Steps to reproduce the issue

1. Go to /administrator/index.php?option=com_joomlaupdate&view=upload and you see blue button, called as "select file". This button has no translate in joomla language files. When your browser and whole system (win, macos, etc) in for example - polish, but joomla language in English or other - button stay at polish.

Expected result

Actual result

My proposition

in file administrator/components/com_joomlaupdate/tmpl/upload/default.php at rows 74 add some as

    <label for="install_package" class="custom-file-upload"> <?php echo Text::_('COM_INSTALLER_SELECT_FILE_BUTTON'); ?></label>
    
    <input class="form-control" type="file" id="install_package" name="install_package" accept=".zip,application/zip">

Device and system info

• What version of Joomla were you using?
  Joomla 5.3

• What device were you using? (eg, phone, laptop)
  laptop

• What web browser were you using? (eg, Chrome, Safari)
  Chrome, Mozilla

• If you were using assistive technology, please let us know the device or software you were using (eg VoiceOver, JAWS, sip-and-puff device, etc)

Additional comments

If you know which WCAG or ATAG criteria this violates, please indicate it here: