Refactor profile-edit, candidate-profile, proposed-candidates, and registration forms

- Added a new div container in profile-edit.php for better layout structure.
- Removed the back button from candidate-profile.php to streamline navigation.
- Updated proposed-candidates.php to open candidate links in a new tab for improved user experience.
- Modified registration forms to make the profile visibility checkbox optional, enhancing user flexibility.

templates_user/globelus/firms/proposed-candidates.php

@@ -29,7 +29,7 @@
               <div class="row">
                 <div class="col-12 col-sm-8">
                   <h2>
-                    <a href="/proponowany-kandydat/<?= $candidate['id'];?>/<?= \S::seo( $candidate['surname'] . ' ' . $candidate['name'], true );?>/" title="Kandydat: <?= addslashes( $candidate['surname'] . ' ' . $candidate['name'] );?>"><?= $candidate['surname'] . ' ' . $candidate['name'];?></a>
+                    <a href="/proponowany-kandydat/<?= $candidate['id'];?>/<?= \S::seo( $candidate['surname'] . ' ' . $candidate['name'], true );?>/" title="Kandydat: <?= addslashes( $candidate['surname'] . ' ' . $candidate['name'] );?>" target="_blank"><?= $candidate['surname'] . ' ' . $candidate['name'];?></a>
                   </h2>
                 </div>
                 <div class="col-12 col-sm-4 sex-and-birth">