po: Update translations to build with gettext 0.26

po: Update translations to build with gettext 0.26

Gettext 0.26 validates format strings. In some cases before
the GRUB build process was converting newlines sequences (\n)
to (\<translated character>) which is invalid. Update the
impacted language sed script files to ensure newlines use
the correct escape sequence.

This avoids build errors such as:

  de@hebrew.po:8192: 'msgstr' is not a valid Shell printf format string, unlike 'msgid'. Reason: This escape sequence is invalid.

Fixes: https://savannah.gnu.org/bugs/?67353
Signed-off-by: Andrew Hamilton <adhamilt@gmail.com>
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>