Translate page.tpl.php strings
Just edit the page.tpl.php file and wrap all text in t() function.

For example:

&lt;p&gt;This is a sample string.&lt;/p&gt;


Turns into:

&lt;p&gt;&lt;?php print t('This is a sample string.'); ?&gt;&lt;/p&gt;


EDIT: this will make those strings translatable. After that, use the translation interface to find those strings and translate them in other languages.
If your original question was about where you can translate those strings in the admin, let me know and I'll update the answer.