[Xfce-i18n] Netload panel plugin updated

[Mike Massonnet]

Hello translators,

strings in netload have been updated/added, especially mnemonics in
the settings dialog.

https://translations.xfce.org/projects/p/xfce4-netload-plugin/c/master/

@Pjotr, thanks for the quick updates, please take also care of the mnemonics ^_^
  $  LANG=C msgfmt -o /dev/null -c --check-accelerators=_ nl.po
nl.po:81: msgstr lacks the keyboard accelerator mark '_'
nl.po:85: msgstr lacks the keyboard accelerator mark '_'
nl.po:89: msgstr lacks the keyboard accelerator mark '_'
nl.po:93: msgstr lacks the keyboard accelerator mark '_'
nl.po:101: msgstr lacks the keyboard accelerator mark '_'
nl.po:105: msgstr lacks the keyboard accelerator mark '_'
nl.po:109: msgstr lacks the keyboard accelerator mark '_'
nl.po:117: msgstr lacks the keyboard accelerator mark '_'
nl.po:125: msgstr lacks the keyboard accelerator mark '_'
nl.po:141: msgstr lacks the keyboard accelerator mark '_'

Kind Regards,
Mike