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ETA: Test edit 2.0.18

// Otherwise they're a guest - this time ask them to either register or login - lazy bums...
elseif (!empty($context['show_login_bar']))
{
echo '
<script type="text/javascript" src="', $settings['default_theme_url'], '/scripts/sha1.js"></script>
<form id="guest_form" action="', $scripturl, '?action=login2" method="post" accept-charset="', $context['character_set'], '" ', empty($context['disable_login_hashing']) ? ' onsubmit="hashLoginPassword(this, \'' . $context['session_id'] . '\');"' : '', '>
<label for="user">
', $txt['username'], '
<input type="text" id="user" name="user" size="10" class="input_text" />
</label>
<label for="passwrd">
', $txt['password'], '
<input type="password" id="passwrd" name="passwrd" size="10" class="input_password" />
</label>';
/*
<label for="cookielength">
', $txt['cookielength'], '
<select id="cookielength" name="cookielength">
<option value="60">', $txt['one_hour'], '</option>
<option value="1440">', $txt['one_day'], '</option>
<option value="10080">', $txt['one_week'], '</option>
<option value="43200">', $txt['one_month'], '</option>
<option value="-1" selected="selected">', $txt['forever'], '</option>
</select>
</label>
*/
echo '
<input type="hidden" id="cookielength" name="cookielength" value="-1" />

<input type="submit" value="', $txt['login'], '" class="button_submit" /><br />
<div class="info">', $txt['welcome_guest'], '</div>';

if (!empty($modSettings['enableOpenID']))
echo '
<label for="openid_url">
', $txt['openid'], '
<input type="text" name="openid_identifier" id="openid_url" size="19" class="input_text openid_login" />
</label>';
echo '
<input type="hidden" name="hash_passwrd" value="" /><input type="hidden" name="', $context['session_var'], '" value="', $context['session_id'], '" />
</form>';
}
ETA: Test edit.

Is there a HTML entity for a search icon used in search engines or search bars in different websites. I know most of them use images but is there any HTML entity for it?

The custom textareas for some of this theme's settings are potentially a security risk. They are not really more of a security risk than many other items in Admin, but it would be prudent to ensure that anybody you do not really trust does not have access to them.
These settings are very versatile. For example, by inputting javascript you could use them to run a custom jQuery slideshow. If somebody wanted to, they could also input malicious javascript that would do all sorts of things to unwary vistors.

Frankly, the options available in Admin allow anyone to do this anyway, with or without this theme. However, you should be careful about what code you accept for use on your own site. If you do not know what it does, have it checked by someone you trust.