Use replaceAll to ensure all newlines are converted to HTML line breaks

[DL6ER]

What does this implement/fix?

Fix only the first newline of settings descriptions being properly rewritten into a HTML line break. This is implemented by replacing X.replace() -> X.replaceAll() and a classical "slip of the pen" bug.

Currently, the following setting descriptions are affected by this:

• dns.domain
• dns.rateLimit.count
• webserver.acl
• webserver.port
• webserver.tls.cert
• misc.dnsmasq_lines

Cfm. the effect of this change in the following screenshots (red = newline not replaced, green = newline replaced):

development-v6 branch

This PR

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Related issue or feature (if applicable): N/A

Pull request in docs with documentation (if applicable): N/A

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