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Update nl.po

Fixed spelling error in Dutch translation file.
Merge pull request #1178 from EagleErwin/patch-1

Update nl.po
Update config.rst

Fixed typo in description of config:option ProxyUrl
4.2.1 release

Signed-off-by: Marc Delisle <marc@infomarc.info>
Merge commit 'f23ae33'
Merge commit '9f9d85c'
Merge pull request #1179 from EagleErwin/patch-1

Update config.rst