Add Portal Link in Administration Control Panel

In the upper right corner of the Administration Control Panel are links for "Admin index" and "Board index." I would like to add a link for "Portal" that would take me back to the main portal page. Where and how might I add the link?

I've made some progress on this, but need more help.

In \phpbb3\adm\style\overall_header.html, find:

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<p><a href="{U_ADM_INDEX}">{L_ADMIN_INDEX}</a> &bull; <a href="{U_INDEX}">{L_FORUM_INDEX}</a></p>

Replace with:

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<p><a href="{U_ADM_INDEX}">{L_ADMIN_INDEX}</a> &bull; <a href="{U_PORTAL}">{L_PORTAL}</a> &bull; <a href="{U_INDEX}">{L_FORUM_INDEX}</a></p>

In \phpbb3\language\en\acp\common.php, find:

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   'PIXEL'                        => 'px',


Add after:

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   'PORTAL'                     => 'Portal',


Then purge the cache.

This puts the "Portal" link at the top of the Administration Control Panel like I want, and the link takes me to the portal page. Unfortunately, it logs me out! How do I fix it so that clicking the link does not log me out?