Finding where to Change Create Account and Forgotten Your Password

Hello
I am new to the forum and I wasn't sure where to post this. I have been having problems trying to find where to change some wording. I am working on a site for someone in Polish. I don't know polish, but for some reason the polish language pack is pulling up some English words. In the header where you click log-in it brings down another menu which has the words Create Account and Forgotten Your Password? in English. I can't seem to find the files that have these words to be able to change them. The site is: http://www.kosmetykirpa.com/store/ and it is located under the words Zaloguj Się.
The code where the words appear is as follows:
<div id="log_in_header">
<form name="loginheader" action="https://web230.secure-secure.co.uk/kosmetykirpa.com/store/index.php?main_page=login&amp;action=process&amp;zenid=49f040537bfdeb86ef71f3005 dfd6e4e" method="post"><label class="inputLabel" for="login-email-address">Adres email: </label>
<input type="text" name="email_address" size="18" id="login-email-address" /><br class="clearBoth" />
<label class="inputLabel" for="login-password">Hasło: </label>
<input type="password" name="password" size="18" id="login-password" /><input type="hidden" name="securityToken" value="64671af5cc1dee95de78f2425cdad0a0" /><input type="image" src="includes/templates/template_default/buttons/polish/button_login.gif" alt="Zaloguj Się" title=" Zaloguj Się " /><br class="clearBoth" />
<div class="buttonRow back important"><a href="https://web230.secure-secure.co.uk/kosmetykirpa.com/store/index.php?main_page=create_account&amp;zenid=49f040537bfdeb86ef71f3005dfd6e4e">C reate Account</a></div>
<div class="buttonRow back important"><a href="https://web230.secure-secure.co.uk/kosmetykirpa.com/store/index.php?main_page=password_forgotten&amp;zenid=49f040537bfdeb86ef71f3005dfd6e4 e">Forgotten Your Password?</a></div>
</form>
Any help as to where I can find this and change it will be greatly appreciated.

Michael