On small screens, the "Sign in", "Register", "My content", "My account"
and "Sign out" links didn't have much padding nor space between them,
and it was easy to accidentally click the wrong link.
This change also positively affects the menu on medium and large
screens. When one of the options (like "SDG content") had a text
spanning over two lines (like it happens in Swedish), there was barely
any space between those two lines. So we're using `line-height: inherit`
instead and adjusting the padding accordingly.
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