Language files: Fixes bug#12701 - Line removed from proxy.cgi no longer needed in...

Language files: Fixes bug#12701 - Line removed from proxy.cgi no longer needed in lang files

- v2 version that has only the removed line in the language files diffs
- Line removed from de, en, es & fr
- No translations had been done for the other languages for that line.

Fixes: Bug#12701
Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>