Added text to 404 template to suggest logging in might help

This patch adds a prompt to the 404 page to suggest that logging in might resolve the issue.

added 2 commits

• 0972b7d8 - 1 commit from branch lscsoft:master
• a76fd712 - 404.html: added text to suggest logging in might help

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added 6 commits

• a76fd712...2176fdbe - 5 commits from branch lscsoft:master
• 353ac75c - 404.html: added text to suggest logging in might help

Compare with previous version

merged