Translate `library/readline.po`

[sofide]

This file is 78% translated and needs to reach 100%.

The rendered version of this file will be available at https://docs.python.org/es/3.13/library/readline.html once translated.
Meanwhile, the English version is shown.

Current stats for library/readline.po:

• Total entries: 56

• Entries that need work: 12 - (22%)

  • Fuzzy: 4
  • Untranslated: 8

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