It is at ftp.gnu.org and mirrors in gnu/gettext/gettext-0.10.37.tar.gz

It is a bugfix release of 0.10.36.

Note that Chinese/Japanese PO files in Big5, GBK or Shift_JIS encoding must
be modified when switching from 0.10.35 to 0.10.37. A command like
  "env OLD_PO_FILE_INPUT=yes msgmerge zh.po PACKAGE.pot -o zh.po.new"
will convert a PO file from 0.10.35 syntax (with extraneous backslashes)
to 0.10.37 syntax.

Bruno