Dear julianserna,
Regrading the LastUpdate text you can open the file of language/your_languge/your_language.ini and add at it’s bottom this line
LAST UPDATE=your text goes here
About the login at the ja login module you can open the file of templatesja_socialhtmlmod_jalogindefault.php and look for this HTML Code
<a class=”login-switch” href=”<?php echo JRoute::_(‘index.php?option=com_user&view=login’);?>” onclick=”showBox(‘ja-user-login’,’mod_login_username’,this, window.event || event);return false;” title=”<?php JText::_(‘Login’);?>”><span>Login</span></a>
You can change the login text here
I hope these make sense ~!