You can change the language in the language file which you find in: /joomla-root/language/en-GB/gk_musicity.ini
I might have gotten the file name wrong there but it should look like something like that. Open the file, search for the thing you want to edit and then change it and save.
To change the register link so that it goes to Jomsocial you need to first publish a login module in the login positioin. You shouldn´t have any module published in the register position.
Then download and edit the file:
/joomla-root/templates/gk_musicity/layouts/blocks/logo.php
On line 50 you will find this code:
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<?php if((GK_REGISTER) && ($userID == 0)) : ?>
Change it to:
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<?php if((GK_LOGIN) && ($userID == 0)) : ?>
Then on the line below (line 51) you will find a Joomla register link just after this code:
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<a href="<?php echo $this->URLbase(); ?>
Delete that link and replace it with your Jomsocial register link, it should be a relative link.
Save and upload your file to your site again, clear your cache and it should work now.