Version 0.19.4

• The --keyword option of xgettext now accepts same argument number for both singular and plural forms.
• Programming languages support:
  • C#: xgettext now properly handles Unicode characters encoded with
    surrogate pairs.
  • C/C++: xgettext now recognizes ISO/IEC 9899:2011 string literals
    prefixed by R, u8, u8R, u, uR, U, UR, L, or LR.
  • Shell: xgettext now properly recognizes Bash ANSI-C quoting ($'...').
• Bug fixes:
  • Fix integer overflow when reading certain MO files with msgunfmt.
  • Avoid invalid memory access in various cases. In particular, when
    the same argument number is specified for singular/plural
    arguments, and when checking Lisp and Scheme format strings.

See upstream announcement for more details.