openvpn: Clean up DH download code.
openvpn: Shortened word to prevent line break.

* Shortened Diffie-Hellman to DH in language files to
affort a better look in WUI.
Merge remote-tracking branch 'ummeegge/openvpn'
Rewrite redirect_wrapper.

The wrapper had multiple errors in handling the new version of the
squid redirector protocol and was awful to maintain as it did not
fulfill any coding guidelines at all.
Update translations.