I've modified the Jira login gadget as described here:
Now when opening the "main URL" ("/" in my case), the https://JIRASERVER/secure/Dashboard.jspa URL is opened and the change I made to the login.soy file is visible there (added a link).
However, when clicking "Log in" in the upper right corner (or clicking "Log in again" on the logout page), the user is taken to a different URL: https://JIRASERVER/login.jsp
On that URL, the changes made to login.soy are not visible.
How can I change that login screen also?
You will have to modify the jsp file in your JIRA install.
<INSTALL FOLDER>/atlassian-jira/includes folder contains loginpage.jsp, loginform.jsp, login.jsp
Check this doc. in order to update/modufy the JSP file
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