xgettext

Extract gettext strings from code files. More information: https://www.gnu.org/software/gettext/manual/html_node/xgettext-Invocation.html.

• Scan file and output strings to messages.po:
  xgettext {{path/to/input_file}}
• Use a different output filename:
  xgettext --output {{path/to/output_file}} {{path/to/input_file}}
• Append new strings to an existing file:
  xgettext --join-existing --output {{path/to/output_file}} {{path/to/input_file}}
• Don't add a header containing metadata to the output file:
  xgettext --omit-header {{path/to/input_file}}